Me, I'll go with Dogtra all the time, period. I've had TT (good unit without a doubt - no problems), DT (problems with range and stimulation) and Innoteck (pure junk, IMHO, this includes Cabelas brand and Lion Country Supply). Dogtra has proven itself in my book, never had one problem with it Xmiter and beeper work flawless, well made, reliable. Overall as I said A number one.
Check out Pointing Dog Journal BBS great forum on pointing dogs and lots of good folks and advice. They tell it like it is.
Good Luck!!
Greg