We took my 850 and my dads 550 out to our local trail park on sat. and my friend with his new brute went with.The temps were in the mid 60s and no wind,all of the snow was really melting and the trails were very muddy.The first thing i noticed was how much fun the 850 is to ride it handles so much better than my 800 did on these same trails and i used to love it.I help maintain and build new trails at this park so i ride there almost every weekend and im really looking forward to going back when its a litte drier.The xtrs really worked good although i was way muddier than my dad with his stock tires.These xps are awesome machines!!