Shawn Craigwrote a review of G3 ION 12 Binding with Brakes on January 16, 2017
Familiarity: I've used it several times
I replaced my old pair of Dynafit TLT Vertical (the first year they were released). So better performance on bindings should be expected at this point. These are great. I feel like there is a solid engagement and they ski well. I've used them both in bounds and touring and they have a very ensuring feel to them.
Only cumbersome issue is the need to remove skis to go from ski to tour mode and vice versa. You can get them into ski mode from tour mode without removing, but it's cumbersome and just seems easier to remove the ski.
Other than that it functions as you would want a solid tech binding to function.