I have heard similar stories about DT' s customer service, although I have never dealt with them personally.

Tri-Tronics has about the best customer service out there, with very fast turnaround and they will even pay for your shipping. A few things do go wrong with their products so it is nice to know they will take care of it if necessary.

Innotek has decent customer service and a decent product, but Tri-Tronics is more reliable.

I don' t know about Dogtra' s customer service because no one I know has ever had anything go wrong with one of their products...and that is quite a few perfectly-performing units!!