I picked this up as I had an open circuit in an apartment that took out the 3 receptacles at the end of a branch.  Without this I couldn't find where the break was upstream.  This tool provided a quick and easy solution as I was able to trace the romex buried under the drywall with out a problem.  It is intuitive to use if you have ever used any of the comparable products out there.  I had a different brand that took AAA and watch batteries in the base unit and wand so the 9V batteries this uses is a nice feature.  I don't have to go looking for the little watch batteries around town when I get in a pinch and need the tool now.  Also, this seems sturdier (albeit more expensive) than the previous one I owned.  Of course I stepped on the wand from my other one and that ended its useful life.  Hopefully I can keep my size 13's off of this one.  I have to admit that I am probably biased toward Fluke products as I have a Fluke multimeter from the late 1980's that is still working fine.  If you need this thing immediately it is available at Home Depot as well.