In a more detailed rating system, I'd give this tool five-stars for concept; four stars for function; and three stars for design.

***** This is a great concept in a useful device -- essentially a torque-wrench for tensioning drum-heads.  There are standard equations which relate the tensionsing of the screws holding down a drum tension hoop directly to the tension on the drum head.  The Drum Torque allows you to essentially set all of the tension screws to the same torque, assuring that the drumhead is evenly tensioned.  Even tensioning produces the best tone, and prevents uneven wear, increasing the life of the head.  Once you have the head tuned where you like it, you can simply read the torque number (in Kg/cm) off the dial of the Drum Torque, and record it for future reference.  Next time you replace the head, adjust the screws to that torque, and the head should be pretty close to the optimum setting you had with the previous head.

Works for tensioning banjo heads, too.

**** As far as function, it does what it's supposed to do, but not with any great finesse.  It's hard to imagine the coarse pointer on the dial giving any greater accuracy than +/- 2 Kg/cm, which, considering the whole range is 2-25 Kg/cm, gives a spread of more than 16% wiggle room.  Close enough on large drums, perhaps, but it leaves something to be dsired on smaller heads and banjos, where more precise tuning may be desired.

If you're really fussy about tuning heads, I'd recommend using this along with a drum head tension gauge, like the DrumDial.

*** Design is where this tool could really stand some improvement.  First off, it isn't really as stoutly made as the nearly $50 sticker price would lead one to expect.  It's made entirely of plastic, including the socket end which accepts the wrenches that are actually applied to the drum screws, and the wrenches themselves.  They do amazing things with plastics these days, but it's hard to imagine that these parts will stand up to repeated use nearly as well as metal parts.
For $20-$30 I'd be happy with plastic; for $50 I expect at least the business-end parts to be steel.

Then, the socket in which the tools mount is friction-fit only; no spring-loaded bearings, or screw chuck, or even a set-screw.  You just shove the tool into the hole, and hope it stays there until you're done.

But perhaps most annoying is that the tool socket is a /square/ rather than hex hole, and a /non-standard size/ hole at that.  This effectively prevents using any tools but the two plastic tips which come with the device.  Had they made this hole to accept a standard 1/4" hex shaft, it would be possible to use this tool with any of the interchangable bits from a standard power screwdriver kit, including a full range of standard and metric sockets.  This would be a great boon when using the tool on, for example, banjo head nuts, which come in three standard (and a number of non-standard) sizes.  Instead, the best you can do is install the "fork" tool, and hope it fits over the top of whatever drum or banjo key you need to use.  Really, a small design change here could make this a /much/ more versitile tool, and justify the higher price.

Bottom line:  Does what it's supposed to, mostly; price is a little high (for what it is), but not outrageous.
In a more detailed rating system, I'd give this tool five-stars for concept; four stars for function; and three stars for design. ***** This is a great concept in a useful device -- essentially a torque-wrench for tensioning drum-heads. There are standard equations which relate the tensionsing of the screws holding down a drum tension hoop directly to the tension on the drum head. The Drum Torque allows you to essentially set all of the tension screws to the same torque, assuring that the drumhead is evenly tensioned. Even tensioning produces the best tone, and prevents uneven wear, increasing the life of the head. Once you have the head tuned where you like it, you can simply read the torque number (in Kg/cm) off the dial of the Drum Torque, and record it for future reference. Next time you replace the head, adjust the screws to that torque, and the head should be pretty close to the optimum setting you had with the previous head. Works for tensioning banjo heads, too. **** As far as function, it does what it's supposed to do, but not with any great finesse. It's hard to imagine the coarse pointer on the dial giving any greater accuracy than +/- 2 Kg/cm, which, considering the whole range is 2-25 Kg/cm, gives a spread of more than 16% wiggle room. Close enough on large drums, perhaps, but it leaves something to be dsired on smaller heads and banjos, where more precise tuning may be desired. If you're really fussy about tuning heads, I'd recommend using this along with a drum head tension gauge, like the DrumDial. *** Design is where this tool could really stand some improvement. First off, it isn't really as stoutly made as the nearly $50 sticker price would lead one to expect. It's made entirely of plastic, including the socket end which accepts the wrenches that are actually applied to the drum screws, and the wrenches themselves. They do amazing things with plastics these days, but it's hard to imagine that these parts will stand up to repeated use nearly as well as metal parts. For $20-$30 I'd be happy with plastic; for $50 I expect at least the business-end parts to be steel. Then, the socket in which the tools mount is friction-fit only; no spring-loaded bearings, or screw chuck, or even a set-screw. You just shove the tool into the hole, and hope it stays there until you're done. But perhaps most annoying is that the tool socket is a /square/ rather than hex hole, and a /non-standard size/ hole at that. This effectively prevents using any tools but the two plastic tips which come with the device. Had they made this hole to accept a standard 1/4" hex shaft, it would be possible to use this tool with any of the interchangable bits from a standard power screwdriver kit, including a full range of standard and metric sockets. This would be a great boon when using the tool on, for example, banjo head nuts, which come in three standard (and a number of non-standard) sizes. Instead, the best you can do is install the "fork" tool, and hope it fits over the top of whatever drum or banjo key you need to use. Really, a small design change here could make this a /much/ more versitile tool, and justify the higher price. Bottom line:  Does what it's supposed to, mostly; price is a little high (for what it is), but not outrageous.