Replying to Marker Duke - do they really rip out of ski's?

So,

I need new bindings. Fast.

Am looking at three options atm:

STH Driver 14/16
Look Pivot 18 (heard the 14's have a really weak toepiece [plastic])
Marker Dukes.

I really want to get more into non-liftaccesible lines, but I still want an alpine binding. It's just that I'm a little wary to get Marker Dukes because I have heard a lot of things about them ripping out of ski's and what not.
Is this really true or am I just a nerd who shouldn't be scared because some noobs didn't get their Dukes mounted right?

Also, one more question:
The Pivots, will they last me a lifetime? I really have the feeling that if I purchase the P18's once they will last me 20 years as long as I don't wear out the spring (which I won't because I won't go higher than 12 anyway).
And what about the STH', are they all metal too?


Last question:
STH vs Pivot's. Which are better?

Fuck karma, I'll give you a bluetooth-BJ for helpful answers.