Hey man. I'm on VZW and have been using the Mr. X ROM for about 3 weeks straight now. I believe if I could sum it up in three words I would say stability, stability, and stability. He has even cooked in a provisioning CAB under Start>Connections>Mr. X Provisioning for Verizon. You just run the provisioning program, it does an auto install of the VZW specific CABS, and you're up and running on VZW!
Again, VERY stable ROM. I never even have to soft reset. I've tried several different ones but I only end up using them for a couple hours and then it's back to the Mr. X! Here's the link to the thread for it.
http://forum.ppcgeeks.com/showthread.php?t=91898
Edit: Oh, and it's really fast too.