I've heard of some people complaining about the heel piece developing some play along the tracks (not the actual heel piece developing play with your boots' heel lug) over time. Sounds like it tends to occur in bindings with plastic heel tracks. While I've used STH2s for no more than 2 days, I've had Griffons that saw plenty of use over the course of 3 seasons without any issues. FWIW I don't ride park.
Also heard of people having prerelease issues and having to up their DINs as a result, but it also sounds like this is avoidable as long as you set up your toes and forward pressure properly and monitor it regularly.
Too lazy find and link source, but I think you can find this info on TGR if you just google search.
As for differences between the 13 and 16 din STH2s, yes the construction is the same besides the springs. However, next year's 16 has some sort of toggle by the AFD to set two different dampness settings. I'm calling snake oil on this, plus from what I can tell, this toggle thing seems like it makes your toe lug stand a bit higher off the ski. I think 13 remains exactly the same.
As mentioned, I've only had 2 days on the STH2s, while I've had about 15 or so on attack13s. Both were pretty easy to step in to in soft snow. I do notice the attacks feeling lower to the ski, but that feeling disappears and they all feel the same to me (including Markers) once I get to up to speed, especially off piste.
I don't think I gave the STH2s a fair shake, especially considering I put them on a pair of heavy ass/pre-light weight Bent Chetler 120s, so I'm putting them on my daily drivers next season. If I rode a lot of park, I'd probably go for the attacks with their lower weight, ramp angle and stack height.
