We bought a bunch of new sleds in our riding group this year, and I was lucky enough to ride with all varietys on a steady basis. Heres what we found. 09 M8 and XP 800 ( one 162 and the other 163 ) were neck in neck, and both riders weighed in about the same 220ish range. The dragon 163 had the full bolt on SLP kit (No head mod and no porting) and it was a riot to ride but was not quite there with the stock M and XP. My M1000 has a full D&D exhaust, BDX intake, Boss seat and M8 gears. I was expecting alot from this sled and was honestly dissapointed at first, I was running dead even with the M8 and XP. Then we tried a switch, I`m 6`5" and weigh 295 lbs and who new it made that much differance! Me on the M8 or XP went from even to about 150-170 feet lower on the hill, my 220 lb buddy on my 1000 blew past all our marks and only turned out when the point was obviously made. If youre over the 230-240 mark forget the 800! That being said the only thing I really noticed about the way they handled differently is that the 800 power is smooth and linear, and the 1000 is pretty rammy and wore my buddies out alot quicker. End of rant.