Just used him for the 1st time in an OL, and I have to say I'm pretty pleased with the results for $10M:
51 GS, 26-12, 2.87, 1.22 WHIP in 361 IP.
His performance history is not great (his previous "best" season was 13-21, albeit with a good ERA and WHIP), so make what you will of this one very good season, but I'd definitely use him again in a negative HR park.