[jeremyjh]

Certainly my experience is insufficient. I have only dabbled in profiling and performance analysis - enough to prove it can be done but that it can be time-consuming and that sometimes you may have to give up some elegance/purity in favor of performance. However the performance I get from naive code is so good (so far) that I have not yet actually had to delve into it.

I am dubious of Haskell's prospects in large teams but I was completely dubious of Haskell in general (like you) before I had experience in it. Perhaps after experience with large teams I would be more bullish on this point but I haven't had that experience so far. I am quite optimistic about the size of the problem space that a small, skilled team (say 5 developers) could solve with Haskell.