I have just had my two first hours in the 9s. Been wearing the 8s since they came out, and have worn through 7-8 pairs. Add a few pair of clay 8s to that. I second a lot of what people have been saying. If you liked the 8, probably the 9 is an even better shoe for you.
Howerever, I have not seen anyone adressing arch support and that is why I am making a post, in case anyone is wondering. For me, with flat feet, the arch support in the 9s are not as good as in the 8s. I could feel the strain on my arches.
The fit is snug enough, so I am not sure why this is. But let's just say the support is weaker.
Before the 8s I wore Vapor Xs. And the 9s actually have a similar feel to those in regard to how they feel under foot. The sole is slightly tilted inwards, like the Vapors, to accomodate a wide stance - and the sole somehow accentuates the tripod pressure points of the foot (two in the forefoot, one in the heel)..Even more so in the 9s than the Vapor pros. And I found that absolutely great. I loved that feem. I was super connected to the court, felt I could react and move better. The somewhat muddy feel of the 8s are gone.
But this tilt and the accentuated tripod feel of the shoe, left my arches kinda hanging.
I don't wear my orthotics while running and playing tennis, only walking, so the shoe needs to fit right as is. I managed to play in the Vapors, and hope my feet adapt to these. But right now the arches are sore.
Great update, none the less. Just as stable, if not even more so. Fit was good, no break in, lighter and faster.