I've done considerably more research on tube benders since posting those links, and I have to say I can't really recommend that PIPE bender (yes there's a difference). If you're on a budget, those benders can work but they require some modifications. Search HF pipe bender on YouTube and you'll see what I mean.
To answer your question, that bender actually does better bending thicker Sch40 pipe as opposed to thinner walled pieces. The thin stuff has a tendency to want to flatten and kink as you bend past say 25°. Since I want to build most things out of .120 wall tube (about 1/8") this bender is limiting me on what I want to be able to do. Some guys actually fill the tube with wet sand before they bend it to avoid the pipe flattening on them, I just don't want to have to do that every time!
Tube notchers hold the tube and drill with a hole saw to cut a perfect notch in the end of the tube. My rear cage thread has some good pics of the notchers at work!