I'm a huge watch fan, and this is one of the best that I've owned. I purchased the blue/black combination, and I've had so many compliments on the watch that I'm tempted to get the white one...just so I can switch things up on occasion!
In terms of it's reliability - I haven't had a problem with it at all. I recently had to have the battery replaced, and there was no problem with pressure testing afterward. I've beat it up a bit, and there's not even the tiniest scratch on the crystal.
In terms of style - I own an expensive Tag Heuer watch, and it's stayed in a drawer since I bought the Hammerhead. I love it's style and appearance more than the Tag, and have had a lot of compliments about it.
It has some weight to it too, which I like. At 8 ounces, it's nice and thick, but in a good way. It's big, but is just the right size (if that makes any sense).
I'd definitely recommend this watch as a good purchase.