I already owned ten such clamps when I ordered these.  Only two of the others are Irwin Quick-Grips, and the others are somewhat lower in quality.  I believe this brand is the very best, and it really is like having a helper right beside you.  One hand is all it takes to apply the clamp, loosen it if necessary for re-adjustment, or remove it.  And although this is called a mini-clamp, it is of a size that makes it perfect for countless uses around the house or shop.