We have a german shepherd who has been going through obedience training. The trainer recently suggested getting an e-collar. We have never used one in the past with any of our previous dogs so I have had to do a lot of online research about them. I have it narrowed down to the Dogtra Arc and the Pro-Educator PE-900 (one the trainer recommends). Based on the reviews I found there does not seem to be a consensus that would allow a person to say one unit is definitively better. It appears both companies have people who have had issues with the equipment and customer service as well as both seem to have their own loyal fan following. I was wondering if anyone has used both and can provide a pro's and con's comparison of both the equipment and possibly the customer service. Any insight would be greatly appreciated.