Care to give some alternatives for similar phones in this price range? You search for any phone and you will have positive and negative responses. Simply saying it lags doesn't really help anyone. Are you running some super-duper games that makes it lag or just basic operations is making it unbearable?
I, for one, am going to slap CM10 once I receive it. It's going to have all the bells and whistles of CM and once you remove Samsung bloatware, it will rock - if not already!
From what I can tell, the CM10 port for this phone is in alpha and there are way too many bugs to put it on a phone you plan to use daily. But if you're getting it just to play around with then it seems like a fun thing to play around with.