Nice product... not much to say.  The only reason I give it 4 instead of 5 stars is because the springy (+) tip to plug into my car's socket isn't very springy, and at first the thing wouldn't stay in the socket.  I intend to hardwire though.  For that purpose, the included cable is a little short (about 40") if you need to custom route it.  Otherwise it's a nice length. The product easily opens up and it looks like a power cord replacement is a simple solder job even for a novice like myself.  I'm also impressed that they put an extra fuse on the inside of the device in case someone tries to put a bigger fuse into the thing to get more power.