Same thoughts as Heinz about the Reason sounds (I thought it was the interface). It makes Reason harder to deal with although I really like the Subtractor for bass lines.
I've heard the drum Refill, and I certainly wouldn't trade BFD in for it. To my ears, the sounds are very squished; I just don't get the sense of "bigness" from them. The sounds in BFD still have a good amount of dynamics in them.
Just my opinion!
'course you gotta trust your own ears in the end!