I wanted to upgrade my veer to 2.2.4 but before doing so I wanted to know if it is worth it. So looking arround the forum here is what I've found:
Fairly stable. Personnaly I've never had any real issues. Feel free to report any stability problems
Uber Kernel available: Allows fine-tuning of the CPU frequency and voltage which can make the phone smoother and keep the same battery life
No Skype support
Facebook does not work with https (or very limited, but more of an app issue than Veer)
Device could freeze at startup displaying a blue background with clouds.
MP3 decoder could cut off the ends of long files.
Small issue with Video/Youtube player : 2mm messed up strip at the bottom of the video
Screen unlocks when slider opens up just a little (patch available to correct this)
Insert new line instead of sending sms in SMS app when enter key in pressed (as it is located just under backspace key, it kinda bothers me, so I patched it)
SMS lag corrected
Bug fixes (Youtube/Mp3 players)
Phone may reboot when receiving/making a call (patch available, is it enough though?)
Same facebook https issue?
Some have briked their phone, but now that there is a better way of flashing it, maybe the risk is smaller.
Audio via USB dongle in not proper stereo (no problem via BT though)
I can't help on that since I havent installed it yet
Feel free to bing up more points!