This is the easiest circle cutter I have ever owned. The blade bounces up and down with the click of buttons (one is more like a toggle switch, but only to pull the blade out; there's a small button on one side that you press to reinsert the blade). You can unscrew one side of the blade retention mechanism to loosen it a bit, but be careful not to unscrew it too far or the blade won't actually come loose. I especially like the fact that you can switch the blade from one side to the other for left-handers like me! Changing blades is also easy. For my opinion on this product, see my non-contact knife changer review.
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