Some bands have a lot better retraction rate then others. Take a piece, lay it on your measuring mat and mark down exactly how long it is. Then stretch it to the max elongation, hold it stretched out for 5 +- seconds, then lay it back on the mat and see if it returns to its original length and if it's not immediately then time it. I've only used the .4 Precise and honestly, I'm just not impressed with it at all, when comparred to other top brands as far as accuracy. It has great speed, but it doesn't always retract all the way quickly or evenly. I could have a bad roll, but I've put it on the back burner because a band broke after just a few shots.