I just got the "Sew Easy" brand version, so too new to give a thorough review yet, but so far I'm very excited about it. I've only tried cutting through one layer of fabric folded in half, but that is all I ever do when cutting long strips. (I used to have to fold in quarters because I couldn't keep any other long ruler from slipping but this worked well! I kept my other hand pressed on the ruler side) Also the Sew Easy brand is only 4-1/2" (vs. 6") wide so maybe that is working to my advantage? They are all the same length and the rotary blade stops 1-1/2" in from each end so you end up with 24" of cutting area.
To each his own is so true, because I love Fiskar's products in general so I'm sure I'll be refilling with their blades. (I wasn't aware they made one too.) Furthermore, I previously purchased and returned the "Slidelock" as mentioned above (not a ruler, but designed to hold and lock fabric down in place, while you cut with a regular rotary blade but it didn't work for me, kept sliding) I was very disappointed in it while others love it and rave about it here on the board.