Think of the metal housing pivots, currently the 15 and 18, as an investment. They’re not cheap but you’ll be able to abuse them far longer than any plastic binding.
I have a few sets of P14s that are 5-10 years old, and while they still function just fine, they’re definitely a bit clapped. Since the P15 came out it’s been my go to as they’ll outlast any ski they’re mounted on.
If the weight doesn’t scare you off the only other thing to keep in mind is that the 15 and 18 don’t have upward release in the toe.
TL/DR: There’s a reason why old dudes like their metal bindings, and metal pivots are about as bomber as they come.