Heres my take - Mike and I are currently training together at Golds Venice (except shoulders/chest..I'm getting surgery this thursday)...easily overall the strongest guy I've ever trained with...and always in good shape. EVERY workout we go up to 600+ lb deadlifts. 600+ squats, and bench presses to 500lbs. with corresponding heavy weights on all other exercises...no weight belt, no wrist straps, no knee wraps, no gloves, all full movements. In the past, I've used steroids, so that is the perspective I'm coming from....having said that, I believe Mike is natural, and never have seen anything to make me think to the contrary. Despite his pretty boy looks when hes in shape, by the way, hes as hardcore and as dedicated as it comes.
As far as his attitude...confident for sure, but overall a nice guy...and funny, too.