Cylinder Head decision

Yeah, I was looking at the 302s, but ended up with the 920s falling in my lap. They are closed chamber as well. The only reason I was thinking about them is because I already bought them when I was bored on business trip, they are supposed to be less prone to cracking, and they are also closed chamber. The lack of a hardened seat is a bummer, but the valves to not appear to be too receded. I was really wondering if there were any opinions on CME engines, because it looks like their prices wouldn't be much more than getting the 920s re-worked.

http://www.cmengines.com/CylinderHeads/PerformanceHeads/tabid/69/Default.aspx