This is another tool in the Martha Stewart Crafts line that I purchased two of once they were discontinued and became hard to find. It’s my favorite circle cutter and I’ve tried several! As with most Martha craft tools, there is a learning curve. But after a few online tutorials I was off to the races. The blades are very sharp and precise and easy to change. The top of the cutting tool screws off to store extra blades which is extremely handy. I’m sad to see the low-star reviews here because I won’t use anything else.