I had a TriTronics Pro G2 that lasted me for 10 years. I now have a (Tritronics/) Garmin Pro 550 that is working fine after two years. I have never had to use more than a level 2 for either of my two English setters. When I go to field trials (only to watch!) most of the folks there have Tritronics or Garmin, as do most of the trainers I've ever met. When I have asked why not Dogtra the answer generally had something to do with life of the unit.
