I just bought one today. (Someone's gonna notice these 925 threads that I've bumped, and get tired of it)
On the specs on the Internet, it's 42/16, not 42/15, but I haven't counted it. I'm gonna have to climb some hills travelling perpendicular to a river. I may have to switch to a bigger freewheel. Other than that I can handle the medium hills and the flats as is, on my first day.