My personal expansion on two of the points here...
1. Davis customer service/support. While YMMV, my personal experience with their CS is 5-stars. I recently contacted them about if they offered a repair/exchange program for a defective logger that was just outside of warranty or would I need to purchase a retail replacement. They sent me a new one, no charge! (Returned the old one, of course.)
2. It is very true that unless put on the spot (and sometimes even then) customers are more likely to give negative feedback or none at all, the expectation being that things SHOULD be acceptable or good. My company puts customers on the spot (3rd-party phone survey or focus-group) and then uses a "net promoter score" to come up with a slightly more objective measure. (1-5 = detracter, 6-8 = neutral/unscored, 9-10 = promoter)
Have you ever done this? Take down the number of a random service vehicle and call the "HOW AM I DRIVING" line. Tell them how awesome their driver is, that he stops for old ladies crossing the street and waves-in merging traffic in construction zones, etc. The operator will likely assume it must be a prank, because NOBODY calls with compliments. (Yes, I have done this.)