I'm interested in a set of macro focusing rails. I admit that most of my macro work is near or less than 1:1 magnification, but I also enjoy using my MP-E 65mm 1x-5x which starts getting pretty extreme. My main reason for the rails would be so I could stack images to gain a greater depth of field, so 1 dimension of rails may be enough for me. Sure, the 2 dimensions would probably be handy, but probably also adds quite a bit a cost and worse yet, could remove some of the stability. At 5x DOF is extremely thin, so I would need something with very fine adjustment. I've searched and read tons of reviews. Looks like the Bogen and Novoflex would be up my alley, but even some of those reviews say that fine adjustment is barely sufficient at 1x. I have a feeling I would be disappointed at higher mags. Any real experience out there?