To start off, I was a huge fan of the past STH binding. I am also a huge fan of Tyrolia bindings. I am not a fan of Dildo heels at all.
I had the old STH 12 on my chronics, and that binding was bomber besides the brakes. After buying the new version, I was not impressed with the redesign. The old heel piece had a ton of metal in it, from the track to the housing. The new one is all plastic on the 13, you must upgrade to the 16 for the metal heel. Thumbs down Salomon.
The toe piece is all plastic as well minus the platform / stem. This does not bother me as much as I have never been afraid of busting a toe.
Back to the heel piece. It now sits on a longer track, very similar to the Jester / Griffon base plate. This is a much longer platform than the old STH. Salomon got clever with this and made the track free floating on the forward screws. It's hard to explain, but here is a full thread about it with a beautiful explanation from NinetyFour: http://www.newschoolers.com/forum/thread/794726/Calling-Ski-Techs--Sth2-question
They click in just as nicely as the old heel. So far they have been excellent as far as releasing reliably and holding up to wear and tear.
The brakes are definitely beefier than they were in the past, and they also fit generously as they always have.
My only disappointment is the lack of metal in the heel. If you want that beefy addition you'll have to pony up for the 16. I will always be a user of Salomon bindings. Can't beat that toe and they feel so solid when you step in. I'm hoping to get on some Attacks for comparison.