I have a KNK & a Cricut E, but the Slice tempts me because the design cards are so awesome and the machine is so small & portable. MM has much better designers on their team, IMO!
I actually owned a Slice a while ago, but returned it because it cut wonky. Every time I read about the new/recalibrated machines, I get the urge to be a Slice owner again. Love those design cards!
I'm seriously considering getting a Slice "for the kids" for Christmas. Heck, I'd even let them use it!