I dont believe he has master crafted power fists, he only has two regular ones (I could be wrong)
Re-rolls to wounds
AP2 storm bolters
2+ Save 4+invuln
Does not benefit army
He is a great model.....almost too good in an honor guard, seeing as he has a meat shield . But the fact that he's a whopping 265 pts is not so great in a small game. I mean, he's fun! sure, but for a 65 pt difference you can snag lysander, which is almost as good. But if you wanna have fun with am onster of a model, take em, if you wanna get slightly more competetive, grab another HQ which benefits the army as a whole, more-so then just a self-centered CC beast :p. Vulkan, Shrike,Korsarro, all great choices that affect the army as a whole( for cheaper).
But it all boils down to preference, hope this helps.