A recent issue of Taunton's Fine Homebuilding (about two back I think) did a review of guide rails. Festool was rated Best Overall. Hartville Tool's "Red-Line Cutting Guide" (
http://www.hartvilletool.com/product/10833) was rated Best Value.
I use Festool tools and love them - very high quality, reliable, great dust collection, and work as a system. If I didn't have Festool and wanted a guide rail, I'd jump on the Red Line.
Regards,
Dan.
p.s., I've seen posts on other forums about the EZ system. I evaluated them before choosing Festool. They have a decent system, but their hyper-agressive guerilla marketing tactics turned me off - long winded posts, in-your-face tactics, slamming other products, over-blown claims, etc.