I'm touring with trekkers and have been doing so for three or four seasons.
They're not great in any way, they actually suck in a lot of ways. They can't handle traversing on hard snow, they develop slop over time, screws unscrew themselves, they take a lot of space in the backpack, they are heavy and so on... They do however offer something no other touring binding can, your solid, regular alpine bindings on the way down. In my world that's something unbeatable.
I was on dukes for one season, I broke multiple AFD's and at the end of the season one binding exploded. Marker has made it a lot better since then though, if it wasn't for the ramp angle and height I'd get a pair. Salomon guardian seems to have a lot of problems with developing slop at the heel track so I'd give that binding a couple of more season of development.
There are some things you can do to make Trekkers better, I changed all the screws that goes into plastic to bigger screws for wood. The bigger threads holds up better and wont unscrew as easily. Just make it a habit to tighten all screws after each day and you'll be fine. If you encounter a steep traverse on hard snow, take your skis off and bootpack, it saves you a lot of anger.
All in all, they suck but allows you to ski on your trusted alpine bindings on the way down.
