You could have always taken a few moments to browse our forums.
There are a couple threads that state the cons of it, and as of right now, it is our phones ONLY Rom.
To just state two obvious cons I noticed:
*Battery life is not great because of it being overclocked.
*Bluetooth does not seem to work for some, if not all, people.
Because of the overclock the phone seems to reboot itself at odd times when put under some quick moments of stress.
Guess you could consider the reboot a con also.