Yeah! I have an OtterBox 3000 and I can certainly vouch for their quality! I got the 3000 which is a bit on the big side for the N810 but I wanted to have some extra room for my changer, spare batteries, and earphones.

They do have a hook on them so you can actually lock them with a lock if you want.

You would REALLY have to be trying to actually break one of the these, they're built quite solidly. I bet I could hit it would a sledge hammer and it probably wouldn't even dent it.

The water-tight, air-tight, is nice too since if you drop it in the sea on your boat trip, it'll just float and you can fetch it.

Also if you don't want the extra space, I hear the 2000 will fit the N810 like a glove. The padding on the inside is not thick like with the Pelican cases, but it's more of a dense foam which is about 4mm thick.

Definitely a sound investment for your N810!