Yes - I've playtested both the O3 Tour and the MSpeed 98.
Even though the Fischer is only 2 square inches smaller, it felt more compact and stable on all shots - though still very flexible like the O3.
I liked the slightly tighter pattern on the MSPeed - better control, and yet still great spin from the baseline.
I pretty much did everything better with it - baseline play, S&V, 1HBH. The one edge I'd give to the O3 is in spin production - and in my games, severe topspin ange shots close to the net. Though even on these, I was still more comfortable with my input-output with the Fischer. It just seemed that the O3 shots went in, even when I wasn't certain they would.
I really liked the weight and balance of the Fischer - right in my comfort zone. My current stick is the nSixOne 95 18x20 which I really enjoy, but it can get a little demanding in that 3rd set. I felt pretty fresh with the Fischer all the way through.
The O3 on the other hand was too light - and for me, in need of some lead tape - though I didn't get a chance to experiment with that. I think with some weight at 3 and 9, I could learn to like it a little more.
The Fischer grip is full in your hand, like the Prince, only more square, not round. I liked it - not everyone does. About the only grip that gives me trouble is Head - just too rectangular for my tastes.