Once you go to hard shells, you'll never go back. The performance is one good reason, but the comfort is really the best part. Ski all day without your feet cramping. Worth every bit of money.
I personally ski with a Ski-Tec front hardshell and an RTP. If you ski with double boots, this probably isn't the best setup. I do know some people though that ski with a front Ski-Tec and a loose rubber boot in the rear. For the most part, they have never had any issues releasing from one but not the other.
If you go with double hard shells, Be Careful. Double hard shells don't necessarily equate to less risk of injury. the current design of the fogman and goode binding attach your two bindings to a single plate which velcros to your ski. The release act by the release of the velcro. The problem with this design in the bindings often won't release in a hard out the front. This causes a lot of compression on the front shin and ankle. I think the jager design you're showing above looks really cool and should fix a lot of these problems. Unfortunately, I don't know anyone that actually skis these so I can't comment on their true functionality. My biggest issue with Jager's bindings is the use of hockey bindings. These have always seemed a little heavy and "clunky" looking compared to the lighter roller blade bindings used by Ski Tec, Goode, and Fogman. That's really just a personal opinion though.
Good luck with the search. Hard shells are truly worth every penny. Be careful though, because you will never go back to a soft boot. If you try the Jager bindings, post a review with your opinions.