I have the Simplicity Rotary Cutter and the Binding Tape Maker. I love them both. Haven't had any problems. The tape maker now makes double folded bindings, rather than just single fold.
I have read where people have a hard time adjusting the rotary cutter to cut well, as they didn't really understand the directions. (It's not hard, just turn the screw until the blade touches the plate firmly enough to cut well.) Now they have a table top for it, like the ones for sewing machines. It's a great help in keeping the strips feeding in straight. Otherwise, it is easy to feed them in crooked. Anyway, I like mine, and have no problems. It is loaned out more than it's at home, and so gets well used :) Hope this helps.