Has been spot on. I'm always one to tout when I receive good care and so far they have been great. I called on a busy (well for me) Saturday morning to report my sensor issues. Halfway through the call, my phone dropped, and being as busy as I was (and the fact that I had a new, working sensor on) I decided to hold off in calling Dex in regard to replacing them.
I called yesterday and they had already shipped 2 new G4 sensors off of my abandoned half call. Tracking shows them coming in tomorrow. That is excellent service :D