Horizon Hobby-owned and aggressively policed RCGroups, a Spektrum-pushing paid advertising web site, ran a poll to see how bad the DX8 really is. Surveying primarily Spektrum advocates, their answer came through crystal clear:
The DX8 sure is one horrible radio!
Note, the pro-Spektrum wording of the question leaves open the possibility that up to 100% of the owners have had serious problems:
Poll Results (424 participants on a Spektrum website):
Have you had any unresolved problems with your DX8?
30% Yes 
16% Not Sure (presumably meaning problems are not fixed yet)
54% No 