Well here's the pros
It gives you way more clearence in deep snow before the running boards hold you up
It moves snow much better between the track and tunnel
You can run long studs, with no worries of tunnel damage
It makes it way easier to get the sled to ride on its side, ie in deep snow
If you ditch ride, it makes the sled just a more agressive ride
The intermediates
On a sled with the stock sway bar I could see it being tippy, but rideable
on a sled set up for a 280 lb rider, and 180 lb rider driving, will say it is to tippy
I ran it with the CB medium bar, and had no problems with tippiness, my buddy rode it, thus the 180lb rider, and with a hi rise seat, he thought it was a little tippy, he is a very aggresive experienced rider too
The CONS
When you get stuck, you are in deep
People will say your sled looks goofy, until you out ride them in the deep powder
Lastly and probablly the worst is it raises your snow flap, and really pelts the guys behind you. I always tried to ride last, just to avoid any problems. I may try and make a longer flap.
Mine is on a 136 sled with a 144 extension, thus raising the flap even more. If you know how to set up and work with your suspension, it won't affect the handling of your sled at all.
one benifit of this set up is you don't alter your shaft or suspension at all, so you can put it back to stock very easy. If you have any more ? just ask. Maxdlx