i began using the BCI TDR in 2000 as a locating aid, i loved the BCI and was sorry to see it die in an unfortunate electrical accident. the BCI was replaced with the Triplett 3271 and i have enjoyed a lot of success with it also. recently i acquired a T-3 Innovation Snap Shot and look forward to putting it through its paces this season. the Snap Shot is a SSTDR (spread spectrum time domain reflectometer) which is new to me. this is going to be a fun season and you should be hearing quite a bit about the differences. i guess this will be like everything else i seem to do, i'll take my time and tell you guys how everything is going in stages. i hope that one day we will find a tdr or sstdr that will become a must have for every irrigator.