People often say that you need a big wrist for a big watch. I'm 6'3, 270 pound ex-competitive powerlifter. I have a 8' wrist, and I still think UPO looked too big on me. I think these XXXL watches are just beyond silly.
I initially liked the watch, but the novelty wore off soon. I think I should have given it a chance on a rubber strap, but then again I have so many more nicer watches to wear. The standard SMP (and the chrono) for example.
This is not to say that folks shouldn't enjoy their UPOs (and big watches generally). Just like fat women, they simply aren't for me.