Bob, I have the HF version of that, and it kinks tubes like there is no tomorrow It will probably work if filled with sand.
Southwind, If you want to do tight colapse free bends, go with http://www.jd2.com/ . That's what Arya used for my roll bar, and the results are fantastic. No sand filling needed, and very accurate bends.
For more free flowing curves (LARGE radius), you need a 3 roller bender, but those are $1000...