I own a similar bender to those HF units. And yeah, they bend pipe, not tube. They can actually do a good job of it depending on the exact shaping of the dies. Which is really hit or miss. Commonly the people I know that use them put a peice of 24ga sheet between the pipe and the die as it prevents any inperfections in the die from damaging the pipe.
If you want a 90* bend it works way better to make two 45* bends close together. You just can't get a tight radius out of a die like that.
Like Brett said, you can get good quality pipe that is identical in material and working characteristics as HREW. But, you get strange sizes and walls - which is alright if you're content to live with it. I've seen many an exo build from 1.5 sch40. And internal cages made from 1.75 sch20.