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I like that it's modular with easy to replace parts. For example I broke a mount with a shallow water roll but the main camera was okay and the mount cheap to replace. You have to figure something will break but as long as you don't have to replace everything it's not so bad. Also there are lots of other options for mounting to just about anything.
One thing I'm not as crazy about is that it's only wide angle. That's great for many uses but if you take shots of your buddies at play they seem small and far.