I have a few of the Silverdog kits. IDX pro, TGSL, Surf PI and the Barracuda.
The TGSL works pretty well, I have a few spools of magnet wire and several coil housings so I can make coils for them.
It gives me something to do during the winter months.
I just checked and he has a unit called a Minipulse. I will have to get that one too.