Funny how many people the 250 isn't a good track day bike.
Tell that to those of us who race ours.
One of the vendors at our race club rents 250s all set up for the track, for about $300/day (discounts for weekends, or the whole season), and some of the guys that normally race on big bikes have started racing with us and they
all say just how much of a blast a 250 is on the track.
I was running better lap times on my 250 than I did on my 600 for a good while (my skills on the 600 have improved to the point where that's not true anymore, but it's easier to go fast on the 250).