Well, my three SPB have exposed snaps. But that's never really been a problem for us.
As for performance, honestly - they rock.
I have one trifold (fleece topped) OC, one hemp with a contour soaker (fleece topped), and I think that the last one is hemp fleece with a trifold soaker. They are my favorite diapers for naptime, and ds is a seriously heavy wetter. (He soaks through a Firefly SleepTight in an hour long nap.)
As for fit - they're quite stretchy...much more so than most of my other front snappers. While that means that they've been fitting ds for AGES...it also means that he can slip them off *way* easier and run around as Captain Naked.
HTH.