I have to agree - having an adjustable binding really gives you an advantage in getting your gear dialed in. I wish more binding manufacturers would take this idea to heart and produce great adjustable bindings. The Tyrolia/Head PowerRail is a great step in the right direction. Some of the other binding systems can mostly do the job also, but I almost ran out of adjustment room on my new Blizzard G-Power skis. The problem was that the binding system was mounted for the default midsole mark, but I wanted my mount much farther forward. I ended up at the very farthest point forward on the adjustment scale for the toe and heel just to get my BoF in the right spot.
So there is a caveat with some manufacturers (including Head). I almost ran into the same thing with the Head Chip 78 skis I picked up. They have the integrated Railflex system and I almost ran out of room on the front of the rails to get the bindings where I wanted them. I usually mount Tyrolia plates based on my measurements and then I have the ability to go back or forward 10mm to fine tune the position a bit if necessary. Luckily both sets of my new skis are feeling great where I have the bindings so I lucked out without needing to do anything really drastic.