Sizzix dies, cuts felt... and waaay cheaper than the Cricut. It was discussed in Lambs Group not to go with Cricut but Sizzix instead.
Also, when you read the Sizzix description, it stated it cuts felts... I'm betting it's the dies.
Not that I'm an expert with these dies but from what I read (descriptions and such), they're
compatible with any major brand cutting machine by using a converter...They=> CB, Boss Kut, Sizzix etc dies
I'm sure there's other sites that one can go to, research, but I went here (and the owner that I emailed to..nice lady)=> Crop Stop!, Your one-stop cropping solution