> Well, so RxUI 5.x is 4.5 only

Ah, right - I forgot. 

> in fact, we always have it in ReactiveUI 4.0 too even on Fx 4.0

Right, but only in VS2012 right? I'm currently stuck on FX4 with VS2010. Anyway, point taken - no RxUI 5 until I move to 4.5.

> I'll go halfsies with you

Thanks.