I had no OS/software issues with either of the (2) 900s I've had. If Exchange/email experience was poor, I suggest you not trying the Droid/Milestone, if "first impression" is your primary metric. The 900's native email client's are flawless compaired to its Android competitor, with most everyone opting for a 3rd party offerings, for both Exchange and POP3 support.

If its your job to know a wide range of technologies, then the RMA process, and researching alternate venues of support, should be commonplace, as many, if not all of your concerns/complaints have been addressed, or a "non-issue" for many 900 owners.