I don't think that Boof has any fantasy value, but I do think he's been a nice surprise for the Twins. Certainly better than Lohse of Silva.
I like him for two reasons:
1) His name is Boof Bonser
2) The Twins got Boof, Nathan, and Liriano for AJ Pierzynski while simultaneously clearing space for Mauer. Anything he does is icing on the cake.