In reply to DaveHK: Here is my experience, but before I get slated on the net, I stress it is my personal experience and not given wisdom.
I have at least 8 pairs of skis for different uses and with all the various bindings.
Light weight Dynafit:
- pros: light weight, body centre of gravity lower hence more precision in skiing
- cons: come off for no reason (happened to me several times luckily on easy ground, and to a friend on the rectiligne in Chamonix...less fun). No hardness settting only the walking up lock. For very steep skiing I have to lock them. So no more safety in case of avalanche or fall. Also very tricky to put on when perched on a steep slope. I need help from someone else to hold my ski flat so the I can clip my ski shoe in. Ice gets in the holes on the side of your shoes and the whole operation of putting your skis on suddenly becomes epic. I am talking of ski mountaineering when you have climbed a couloir, the sun is getting warm, a crust is slowly but surely forming and you have to get down immediately.
Diamir:
- pros: more solid (but my son broke one), easier to put on in any circumstances
- cons: heavy when you carry your skis on your back climbing, body centre of gravity too high, twist and have a tendency of ripping off the skis.
None of these allow you to ski with you mountain boots. The Diamir can take some of them but you have 1 mm of overlap at the front of your shoes which is a bit nerve racking. The only binding that will take ski touring and mountain boots are some old Salewa. They are not made anymore.
There are new bindings on the market which look like a good compromise. I am going to have a look at them next week. Surprisingly I need new skis and all in all I will not go for Diamir because of the twist.