CAS have just purchased one, they are doing something to itSad that you need to ask that.
Not experienced the K20A, but owned an S2000 with the F20C which also revved to 9k, and keeping it on cam in the power band was a joy. 240bhp from a NA 2ltr 4 pot is proper engineering.
Oh, and it had zero issues in the 6 years that I owned it.