As of last night, I thought it was running fine. Last night I stopped by the VZW store and played with the Droid 2. Even rooted and overclocked, and running as fast and as stable as I can, the Droid 2 showed me that the Eris is pretty limited.
Now, I'm happy that I have it running this way, rather than having stuck with stock 2.1, and I am glad that there is little ongoing maintenance that I need to worry about (i.e., manually cleaning caches, etc.). I wouldn't mind having a D2, or a DX, or an Incredible, though.