We have all the fast frames and both the large and small clamping system. We have used the fast frames on everything from large gym bags to sides of difficult to hoop flex fit caps. I have found that it depends on where we purchase the sticky backing from as to how well they work. Some backing isn't as sticky as others. We used the pantleg size fast frame to embroidery names down the sleeves of college sweatshirts at Christmastime and it worked extremely well. We use the clamping system all the time to verify designs after digitizing and it gets into small areas that otherwise are difficult to get a hoop such as bags. I just finished a fleece vest left side with an 8 x 5 inch design and it worked wonderfully well with the large clamping system. So far, I have experienced absolutely no slippage of the garment in the clamping system. The only drawback I see so far is to get a Carhartt jacket back on it, there is no place for the excess fabric to go toward the rear. My point is, we have all of them and they each one have their place and use. Sharon