In reply to BigJames:
I don't think you can go wrong either way. They only reason I'm leaning towards the Miura is down to fit, I've struggled with my big toes in the past with regards to bunions and the Miura keeps my big toe in a slightly better alignment than the Solutions.
I climb a lot of steep stuff and both shoes in my opinion are way better than my old Dragons. It's looking like the Solutions have the softer compound rubber so you may be better off with the Miuras with the slightly harder compound to allow you to really pull in with your feet without the rubber 'giving'.
Both shoes have hardly stretched due to the excellent P3 system and I'm very happy with them both so just go and see which ones fit best. The Solutions almost feel like a rubber sock - they're crazy!
At the moment I'm using my gf's Miuras for indoor training sessions and my Solutions for outdoor but that may change as I'm so impressed with the Miuras.