Syzr Pedal Systems transfer power more efficiently to your off-road rig. Rider power is delivered to Syzr pedals directly through the cleats, not through the spongy rubber lugs of the shoe sole. Direct, Through-the-Cleat Power Transfer ensures that no rider energy is lost during transmission. SYZR pedals also use Active Cleat Stabilization Technology to improve the precision of the pedal/cleat connection and eliminate the slop and lateral instability common to off-road pedals. With advanced Roller-Cam Release Technology, Speedplay ensures consistent release in wet or muddy conditions. Instead of the usual metal-to-metal connection that allows other pedals and cleats to seize during release, Syzr cleats feature Ceramic Roller-Cams that do not seize when wet because they roll. In addition to improving consistency of release, the ceramic contacts provide exceptional, long-term durability.
tl;dr Failure as a MTB pedal.
For best uses I put "Indoor trainer" and "Road Cycling", that is not a joke. These are incredibly easy to clip into/out of when dry and clean. They also have adjustable float, making them easy to dial in as far as foot angle goes. That is pretty much where the "Pros" end with these. If you are looking for these things for the Road, get the Speedplay Zero or Light Action. I would not recomend them for riding in the mountains. Here is why:
When dry and clean, if you put any forward pressure on the pedal, they will probably unclip. This includes pedal strikes (hitting the pedal on a rock), so if you heading down the steep part of Dogs and you hit a rock, your foot will probably unclip. Also, when dry, the float vs. unclipped is like an on/off switch. Turn your foot a little, and it has a nice light feel, 1mm more and you are unlipped. This was happening to my inside foot in corners as I pointed my body (and apparently feet) in the direction I was turning and I able to stop this by opening up the float all the way for the inside. This might be solved by tightening the pedal springs but then it would also be harder to clip into and out of the rest of the time (see the mud section).
When they get clogged with mud, they can become nearly impossible to clip into and out of. I have had this problem at Old Cas, Skeggs and Henry Coe (so mud type does not seem to matter).
I have tried SPD, Eggbeaters, Time, and now these looking for the right balance of clip in/clip out tension and "findability" and these have been the worst MTB pedals I have ever used (probably going back to the Time or maybe SPD).
Bottom LineNo, I would not recommend this to a friend