I just ordered the HCW-17 from Amazon. The reviews look good enough for what I need it for. The Shimano one looks nice, but I don't want to drop $50 on a tool I'll use a couple times a year at the moment. I don't plan on changing cogs a whole bunch. I want to try a 17t and 19t to find a ratio that's good for commuting, but once I find what I want I'll probably just stick with it. Plus, I figured I might as well buy a $17 tool to use rather than pay my LBS $5 every time I wanted to try something new.

Btw, free 2 day shipping via Amazon Prime is why I usually buy from Amazon.