The 250 gains a bit more lower mid range snot with a head mod and correct jetting(not too lean). This makes it just about perfect IMO, enough to grunt over stuff, but not too much. I like to have them make enough midrange power to make the map switch effective and useful. If your not a big dude, the 300 is just more excess power to manage. I agree they can be like 450s off the bottom when jetted clean. Of course this is all related to racing and for a trail bike the 300 is tough to beat. I've put about 5 hours or so on my new '12 250, and jetted the same as my '07, its a little softer off the bottom into the lower mid. I suspect much of this is due to the '07 having the head modified for correct squish and compression optimized. I haven't measured compression yet, but the old bike has a stiffer kick for sure. This is typical factory setup for world fuel variability, and I'm going to have Ron take care of the head ASAP. It also may be that the JD Blue needle is a hair leaner in the new bike on its first taper. The '12 has a bit more of a dull tone where the '07 just comes on sooner and pulls through the range very quickly. Its a tough comparison though with a straight silencer on the '07 and the Stealth on the '12 which I will replace ASAP as well. I'll have to see what needles I have in my collection that may make this area a just a bit richer and not screw the rest up. Make no mistake about it this is a fast 250 that is very smooth and easy to ride even with a light ignition. I'm very in touch with the GG 250 motor having had four of them now and tinkered a lot over the past ten years, so I can tell a subtle difference.