I have spent a lot of money on DBP and various addons, model packs and utils over the last couple of years, so I feel qualified to answer.
Problems have been resolved quickly, usually within a day. I have had some strange requests, i.e. changing my username when my old website went belly up, model packs that did weird things. I have always had my problems looked at and resolved quickly.
Some people are impatient and expect a solution within an hour and you see many such complaints in the forum, i.e. "I paid for XYZ over an hour ago and it won't let me download it already" type complaints, but from an intelligent adult's point of view I have found them to be as reponsive as any good company and always willing to help resolve issues and problems.
Hope my "opinion" helps.
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