looks like a very nice one.

The problems with the similar ones I've used is the anvil eventually gets chewed up and my replacement blades are not the right thickness for the blade clamp. It looks like the one you found addresses both issues with one replacement anvil and a different blade clamp system.

I've also purchased http://amzn.to/1R7K7Uy and http://amzn.to/1VCccT8 which are even cheaper for 2. The longer blade does not work quite as well as the shorter blade, but you can have one on each side of the boat as you work.

The anvil problem exists with all of them, but they really are pretty cheap and they last long enough for several boats, so it isn't that big a deal.