I think it's great. I originally bought it to solve a cog-clearance problem on another bike, which it managed fine. It's made by Microshift of Taiwan ... pretty sure it's identical to this one except for the markings and the price:
http://www.rivbike.com/product-p/d41.htm
Took this bike on a pizza run today, first time really riding it this year since I've usually been on my new tandem with the kids. Felt crazy-zippy, and I spent a surprising amount of time on the big chainring!