I have one similar to that, and it works very well. It broke when I dropped it, though...
Lately I've been using the Illuminated 100x from here. They have a 30x, but I haven't used it. I suggest rechargable batteries if you hone a lot.
I find the Radio Shack to be a PITA sometimes because it isn't very stable. It does have a very good light source, though. That is my backup scope.