I've been a 95 user for the last couple of years, and I'm highly considering switching to the Pro Staff 90. It seems to me that lower level players have issues with consistently striking the ball cleanly with smaller frames, the spin-loving players with fast and sometimes unorthodox strokes also have problems with the smaller headsize. Some have issues with the weight of them as well. I'm a d3 college player, and I have the physical tools(I'm 6'4" 200) and strokes to handle the frame, and I love the responsiveness, so I'm almost certainly switching to the 90.
Interestingly, I frame the ball more frequently with the Juice Pro, which has a 96" headsize (The difference in number of mishits actually noticeable.) I think this is from the lower weight of this juice (approx 11.9 oz strung, as opposed to the 12.6 of the pro staff 90.) I think lighter weight slows me down, and the smaller headsize really doesn't hurt me.
I, too, have been a 95 user for years. I recently switched to using 90s and haven't looked back. I have ridiculously more control and feel. And my 1HBH is substantially better. I'm also a d3 college player and big in size (bodybuilding and weightlifting are my other passions; I'm 6'3" 240).