I purchased a pair of Merrel MOAB's a couple of weeks back and have a little bit of a review to post.
I've worn them for some daily wear and they're very comfortable and very stable for that. But more relevantly, I just took them on a trip to the Oregon coast and a jaunt through the Ape Cave at Mt. Saint Helens, and they have stood up fantastically. After a long day of trekking the beach on a blustery day, coupled with a pair of medium-duty wool socks, they kept my feet comfortable and dry, even though I was walking in the tide. The only time my feet got wet was when I got a little complacent and failed to outrun a wave; water promptly sloshed down my ankles.
Even then though, I was able to tolerably enjoy the rest of my day without a change of footwear.
The next day I trekked through both the upper and lower sections of the Ape Cave. This entailed about a quarter/half mile hike through the snow to get to the entrance, and then the entirety of the cave was wet, wet, WET. Water running on the floor, water dripping from the ceiling. Pools of standing water. On top of that, there were multiple piles of rock to climb over, and much of the floor was rough, jagged lava rock, especially in the upper cave. My feet stayed dry, even walking through 3 inches of water, and they provided ample traction and stability for the environment. The tread is still intact, even though I would have expected a chunk or two taken out.
My only complaint was when I mis-stepped a little and caught a pointy rock to the side of my foot. That was a little sore...but, no damage to the boot itself. I also wish the ankle would come up a little higher, given that I'm used to logging boots, but I haven't rolled my ankle or anything yet.
All in all, for ~$130 or whatever I paid, a good purchase.