this is one of the largest controversies around where i ride. it's flat here, but a lot of people seem to think they need a mountain sled. i wouldn't ever get one if you ride trails and ditches. in that case, they suck. they are quite a bit harder to turn, but the traction is great. personally, if i lived in the mountains i'd probably get a 700 short track and put a 2" paddle on it. it's mainly rider's skill, but it is obvious a 151" track can get you further. i like the challenge i guess. long tracks aren't good for jumping, unless you plan on landing in powder. the suspension is much lighter, and won't stand up to as much abuse. also, with the longer track, the sled tends to 'climb' off a jump more and not release as quickly, making it almost mandatory to use your brake every time. i can vouch for this, a good friend bent the tunnel on his brand new 800 ac mc doing this. also, the mountain sleds have a narrower ski stance, so they are less stable. more and more new sleds have adjustable stances though, curing this. it all depends on where you ride. i know way too many people who got a mountain sled because it's 'top of the line' vs a trail sled, but it doesn't fit their riding style in the least. i'd say it's better to have a short track in the mountains than a long track in the flats. just my .02
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'99 XC SP 500