Highest flowing sbm heads?

Just out of curiosity, what do you guys think about The Indy/RHS IMM heads?
I think it's a good head if you can get them for a deal, but I don't think you'll make over 500 without some work on them. Brian's might do it since he works them. Does he even sell them anymore though? I bought a bare set for $400 a few years ago, so I really like them!