We use nothing but Tritronics. I've had Innoteck, Dogtra, Sportdog, & Tritronics over the years. Some collars gave me problems, some were great. My last 3 sets have been Tritronics - their cust. service is great, performance excellent, and longevity good. As long as Tritronics continues to produce quality E-collars, I'll never buy anything but Tritronics.