I think that it comes down to the man who builds what you have with the parts YOU spec out.
I have a small problem with my "parts provided by" DTT, which will be addressed when my guy gets back from vacation. I don't think its something they did at DTT
The problem I have picked up on from ATS rarely seems to be the hardware.
DTT has had problems. There were several I TRIED TO BY-PASS THE CUSSING FILTER storms on here when I first started hanging around.
I too have a problem with limp mode. i think it's a chrysler flash file problem.
Georend has little to no bad reputation, and the same with garmon.
NADP and HTS I haven't seen much feedback on.