I think this is an okay depth signing (to fill the Finley role, for instance), but I don't like the idea of Marquis and Wafer being our two primary backup wings.
Facing reality, it's very likely that Marquis will miss extended playing time this season; he's just a very fragile player. Who becomes our backup SF in that instance? 6'5" Von Wafer? Ray Allen, playing 40 minutes per game? Luke Harangody, who isn't all that athletic for a PF, let alone a SF? None is a terribly appealing option.
I see Wafer more as roster filler; we still need to address the first wing off the bench, in my opinion.