TW shipped me another Q5 demo - I was going to buy one, but they are out of stock in my size.
Basically, it's a lot like a Ki5 - I went into a tournament match with the Q5 right out of the box, and had no issues adapting.
It's a slightly more head light, crisper feeling Ki5.
My elbow felt OK after playing but I noted shoulder soreness again, which I had felt with the Q Tour and do not usually feel with the Ki5. On the other hand, this was the first 3 set singles match I've played in a long time, so that is likely a factor.
I think when they are back in stock I will order a Q5, rotate it with my Ki5, and then decide.