Good move by Poff. He's a solid player, but was never going to get much of a chance to start for the Crusaders with McCaw, Todd and Whitelock all ahead of him, and the likes of Brendan O'Coonor and Bernie Hall coming up through the ranks. He's a great player to have in the squad though, as he always seems to do a good job whenever he gets a chance.
I would think he will get plenty of game time for Wasps, especially given both Serge Betsen and Andy Powell are leaving at the end of the season, though he will likely be on the bench behind Tom Rees in the full strength team.