I agree that your own current situation with billing may drive your opinion about this. At the time of the 2010 ACUC, I was considering bringing my billing in-house. At that time I pushed Jon B to finish PM and commit to a date when it would be ready (he told me 1/1/11). In the intervening 15 months, I have recommitted to my current billing process, so I am much less concerned about whether PM is in AC or not. I do think there are many established users who would like integrated PM and many more prospective ones who would like it. Of course the key is to avoid messing up your EMR in the process of creating a PM.
For a slightly more optimistic outlook: there was a clear reason for creating versions 5, 6, and 7. You might not agree with the reasons, but they were there. After 7 is out, what is next? My hope is that all of AC's development resources will turn to fixing what we already have. If you step away from all of this now and come back in 6 months, maybe 7 will be out, many fixes for 6 and 7 will be out, and work will be well underway towards improving the "base program".
