A word of caution might be in order here.
Although I'm not a ski tech, I've always prefered Markers, skied the MRR Rotamat Turntable style bindings, with all the various toe bindings, for many years on lots of various skis, mostly Volkl, Fischer and Rossignol. I've listened carefully to what several experienced knowledgeable people, including the Salt Lake City Marker rep and distributor service tech people, have told me. As far as I know, the MRR heels have been changed very little, if at all, for several years now, and are compatible with various toe pieces, Twin Cam, Logic, and Titanium series 1200, 1400 and 1500 Free, EPS and Selective Control lifter mounting plates, etc., with the proper componentry.
The MRR heels do have a couple of drawbacks. Since they're designed primarily for narrower, harder snow oriented carving and race skis, wider brakes are unavailable for the Rotamats. (However, they can easily be bent out slightly, just enough to accomodate a mid-width, 85 mm or so.) Also, as a couple other people mentioned, they'll collect heavier wetter snow, which can cause trouble with re-entry; you sometimes have to hassle cleaning out both the boot and the binding thoroughly.
Nevertheless, these MRR heel bindings still have a bit of a following, and are my favorites on some skis that aren't available with integrated binding systems. The combination of shorter distance between the toe and heel mounting plate screws, and the forward pressure independent of the retention setting, allows the ski to flex more freely underfoot. To me, this gives a noticeable improvement in ski feel and performance. Plus, they're light and have proven to be durable, reliable, and safe - provided of course, that they're perfectly properly set up - Ahh, Haa... There's the real catch...!
The forward pressure adjustment, with those 2 screws behind the externally visible arm springs, is separate from the DIN setting screw beneath the arms. The 2 separate settings, using all 3 screws, are closely related and highly critically sensitive. Unless you've been taught how to do this properly and really know exactly what you're doing, in my opinion, for safety's sake, this is something that most people shouldn't be messing around with.
Frankly, I've seen some dubious things posted in this forum from time to time. For instance, someone recently stated something to the effect that the answer to avoiding losing a ski in powder is to crank the bindings up to a DIN of 14...?! In the case of this particular type of binding though - Duke's comment might be worth considering - unless you have the luxury of being somewhere close to a savvy Marker specialist, you might be better off with a simpler binding. Whatever you decide to do, have it done professionally. Inspector Gadget is dead right on this one.
Personally, I'm impressed with the integrated binding systems in general, in particular, the Marker Piston system, love the feel. They're a little expensive but you can find deals on them.
Hope this helps. See you on the hill...
[ December 20, 2003, 09:30 PM: Message edited by: Pilot 3D ]