I have the tritronics g3 2 dog with beeper. Works fine. Charges in 2 hrs. Its 4 yrs old. No probs so far. I also have a older dogtra. Its 10 yrs old at least. Also works great. Both units were 300.00. If I was going to buy another I wouldnt hesitate to get another g3. My son just got one this year for his wirehair. Its worked flawlessly also.