Tom,
I have not read good things about AC PM.
If your old software can "print" a claim, you can keep it, and use Office Ally for a clearing house to submit. They can take your print file, a simple text .txt file, upload it, convert it to electronic format and submit. The cost is nominal $19.95 per month. It has worked well as a solution for me, I am using an old version of my PM software, and hope never to upgrade.
Office Ally also has a free or low cost PM solution although I have not used it, and don't know the details.
For AC, there are those who scoff (you know who you are 8-)) at the fact that I am using 6.3.3, but it works for my needs, and requires none of the BS approvals to install. If I have to, I can prescribe with free Allscripts, and sever my maintenance with AC.
These are my fall back plans to get off the continuous upgrade, headache, worrying path.
