I've been enjoying my new V5 for about 2 weeks now. I've upgraded several aspects of my e46 over the years - but I can say this is by far my favorite. The unit may not be perfect as Jeff mentions, but not only are the minor setbacks identified above (so you know what you are getting into) but also the unit seems to be ever evolving for the better. For the price its way more bang for the buck than any other in dash upgrade I've seen.
If you are on the fence - I'd definitely recommend growing a pair and ordering one. I've shown a few of my buddies - who are all sold on the upgrade and will be purchasing one in the near future. There's no need to fret about potential issues - Jeff's customer service is first class and every possible question I have had has been answered in his forums. Undoubtably the best place to get your hands on one of these devices and release your inner nerd!