The Good: Very good chain retention, looks good, durable, relatively cheap and light.
The Bad: Hardly Anything
I've had this guide for 2.5 seasons now, and have nothing but good things to say about it. Not only is it cheap for a chainguide, it looks great and is still pretty light. Not to mention, I have never, ever dropped a chain with this bad boy. Having only one roller means it is low maintenance, and though the sealed-bearing roller did begin to squeak, it was only because I hadn't maintained it all season. Spent two minutes cleaning it out, and BOOM! Works perfectly (and silently) once again. It's also worth mentioning that it is compatible with a Gamut bash-guard, though the stock bash-guard works fine, and is damn light to boot.
This is a product that truly deserves its 5-star rating. It's fairly light, strong, cheap, and durable. If it ever does break, I will certainly be buying another one.