I've used the YJ bender, and it works fine.
But a few months ago I bought a bender in a red case, and has aluminum dies for the bender from here:
http://www.northwaysmachinery.com/pr...Bend%20Adapter
Comes WITH the reverser attatchments, and is only $120!
Works great, and a big advantage i've found with the aluminum dies vs. plastic dies, is after you make your bend, the pipe comes out of the aluminum dies VERY easily. With plastic dies the copper got real tight and I usually had to hit them off. I would HIGHLY recommend this bender to anyone. VERY pleased with it so far.
Just found the red case bender is also avaliable with plastic dies, beware!
http://www.ebay.com/itm/CBI-CT999-Ra...item35bed72d25