A friend just bought one and we went out yesterday. He only had about an hour and a half on the bike so I wanted to take it easy. All my comparsions are coming from a 250 two stroke, which I've ridden for 10 years now and currently have a 2011 250SX.
I continually stalled it while taking off. It sounds like it's idling at like 4000 rpm, but it apparently has no balls at that rpm. You can't just let the clutch out and have it chug forward, you gotta finesse it with more throttle. These F bike still shift like poo. I shift with a light foot and continually got caught in neutral from 1-2. Had to teach myself to bang it harder like a harley.
This is the first F bike I've ridden where I really felt like it was hard to turn. I didn't get into the power too much, but it supposedly makes 39 RWHP which makes it "feel like a 2 stroke." Yeah, no. It doesn't feel like a two stroke and it still has 10 less HP than my KTM.
It is a "nice" bike I guess, but I can honestly still say from the bottom of my heart that 250F's do absolutely nothing for me. If I had to ride one, I would probably stop riding - for real. At least a 450F would be faster - so I could see myself on one of those in some desperate times or something, but this is supposed to be the best 250F ever made and I can't say I had any jealous feelings. And I really can't wait for this thumper trend to be over with already because after 14 years of their bullsh*t, I'm still not any closer to buying one.