Been using April 1 21898 2.5 standard since it was released. Been extremely happy with what I've seen so far! Very fast, battery has been great and not really anything to complain about. No crashes or slow screens whatsoever. From what I have always read is that the 21xxx series is more stable.
I found out while messing around with this rom about where the heck the "advanced" tab went in the dialer options. It is no longer there for sure but I found what I needed by going to the Comm manager and going into the phone options there. I can edit the canned outgoing text to an incoming caller once again.
I'd like to use the 23554 rom but the March 30th I ran for one day crashed on me and said a PCAP or something needed to be updated, then there was freeze ups etc. Not a good experience
The one thing I would love from the 6.5.X sys is the clock hard set in the upper right corner as it is. Other than that, the large buttons aren't as important.