I've only got the one size 1 1/4". CLR is 3.5 or 4" can't remember right now. I think the size die I got is perfect for what I needed, however, I would have loved to have a couple additional sizes, both 1" and 1 3/4" or 2" that way I could do roll cages.
Pro tools is a good company, they make the dies to order, so it takes about two weeks to get them after you order, but they are made very well and once you have them you have them.
I have used 1 1/8" in it, that's how I built the frame for the new bike I'm working on, however, there is definitely more deformity in the tubing, and the die touches the follower block, making grooves in it that must be fixed before bending 1 1/4" tubing again, otherwise it'll leave marks in the tubing.
I really like the sizing of 1 1/8" for my bike, works out great, however, the only hard thing is that it's not a very common size in DOM tubing. So if you have a metal supply place local to you they'll probably have to order it in.
I'm happy with my 1 1/4" because it fit the beefy look I was going for on my chopper, and also I can use it to make the framing for a sandrail or something and not have it look too thin.
I was lazy putting mine together, but you can make it in a couple days no problem. By far the longest part of it is drilling all the holes. They're pretty large holes so they suck. I eventually took the metal to a machine shop and told them to finish them up for me
Total cost with one set of dies was around $400.00 this is including the air/hydraulic ram.