I picked up the one they have at Walmart when it was steeply discounted at JoAnn's... I'm so glad I didn't pay full price for it... it's awful! It didn't cut straight or consistently and was much more trouble than rotary cutting... and I hate cutting, so that's saying something. I thought it would save time and money (by avoiding wasted fabric due to ruler slippage or just bad cutting) and it did the exact opposite. :(
I tossed it in the trash.