I just installed the v4.1 ..make sure to do a CHECKSUM in Astro or other program to make sure you downloaded it right...I downloaded it 3 times with checksum not being right
So far the rom is somewhat smooth..EXCEPT...the App drawer seems to lag from time to time.
Also I tried GPS and got accuracy of 20m and 30m (Indoors)
Edit: was playing around a bit..got it down to 10m accuracy(indoors) not bad...