I have used alpine trekkers and diamir bindings. The trekkers are servicable but they are heavy and they put your foot up high which makes it more difficult to skin. The diamir bindings are great, lightweight and they release very well. Drawbacks are as follows:
-DIN setting on the diamirs is up to 10, if need a higher setting go with freerides
-bindings are more fragile than normal binding, i.e. don't kick snow off of boot by scraping your bindings, toe piece has been known to break. This is a very light binding.
I know professional guides that use the diamir binding on their everday ski. They say the only thing they don't do with this setup is get big air. If you put a pair of these binding on a nice powder ski, I don't think you will be dissapointed in skiiing either backcountry or lift served area.