This is a great little tool. The tab on top flips up and twists around to change from a small corner to a large corner. No need for two rounders with this tool - it's all in one! And it works really well.
I bought this because it seemed more convient than other tools, having two and spending more money. It's not bad, but it really does take practice! You need to make sure there are no leftover paper pieces in it and you have to get it in the punch PERFECTLY! It's not easy, but i'd say worth the hassle to save the precious scrapbooking funds!
Fiskars is an amazing brand, and I utilize several of their tools. I don't believe the product is at fault. It just takes more time to get it to work as efficiently as my old corner punches.