Hi Eckka. I'm using 6.1 clean v.3,- so far, so good. I've tried 6.5 before, one of the previous version. I found , however, it was consuming way too much RAM + I had severe issues with my device freezing after a hard reset. How about this new version?
I've been running it for three weeks now and have no problems. I've installed and updated software and generally just pushed it and have not had it crash. All the features work without problem. There is generally 65Mb of RAM left when I use it which is fine for me.
I know that GKLeding has updated the ROM I originally quoted and has even created a lite version. Check out his posts for more details.