Are you sure it's the same one listed above? The description of the one at the link says it is made of nylon, not metal. I have this one:
Amazon.com: ProMag PM185 Ruger 10/22 and Carbine Tactical Barrel Band: Sports & Outdoors
which is a metal one made by ProMag. The trade-off is one less rail, but a built-in rattle-proof sling loop. I generally like it, but it isn't perfect for my intended use, and one of the things I wanted to use it for was to mount a light.
First, every edge on the darn thing was sharp enough to shave with; it took me a couple of hours to de-burr and refinish it. Second, the side rail is shorter than the bottom rail, so some accessories (like a TLR-1) won't mount very securely on the side rail. The bottom rail is longer, so I generally use that one. I've used a TLR-3 on it (shorter light, shorter mounting rails), but I'm still not quite as happy with the combo as I'd like to be.
Finally, the rail is not tight to the stock of the gun (bottom rail is worse than the side rail in this regard), and the gap between the rail and the stock, in combination with the added height of the rocker switch levers on the rear of the light, makes for a long stretch to use it. A tape or other remote switch would help in this area.