With a toe pivot and a detachable heel, there's not really any way touring bindings will ever be as durable or stiff as alpine bindings. And $425 really isn't much more than you'd pay for any other AT binding.
That being said, Marker has had a few issues with the part the OP broke this year. But generally, as long as you're just doing normal skiing (ie, not spinning, skiing switch, or massive hucks) touring bindings work great. However, if you expect them to hold up to landing switch you either have no idea how they work or are completely retarded--or both. I know I wouldn't trust the little piece of plastic on my Naxos to hold up to an impact like that.