I have only ridden Polaris sleds since 2011. My Last two sleds where a 2017 Axys 3" and then a 2017 Axys 2.6 with SLP pipe and carls clutching. This year a Bought 2018 Summit SP 154 3" holdover because it was a great deal.
I really didn't know what to expect but I knew the motors are great and the sled is dependable. Not that I had issues with any of my other sleds.
First off, the motor is Fantastic. It has great power that comes on nice and smooth.
I was pleasantly surprised how easily I was able to get used to the sled, mainly the steering. It does take a little bit to get used to but overall not bad.
The thing I like most about this sled in stock form is how playful it is, especially in less than Ideal snow condition. Its just a riot to ride, and gets around very well.
Now for some things I wish I could change,
I really miss my Axys when it comes time to pick a nice steep sidehill line and stick to it. Some of this could be rider error due to getting used to the chassis, but it doesn't inspire a lot of confidence that you can hold the sidehill especially when trying to squirt between two tree holes. I know everyone says to lock out Tmotion, but I really like the Tmotion when not trying to hold a technical sidehill.
The steering effort is basically zero, but this results in two things for me, 1 it takes a lot more input (back and forth) than the Axys to get the same result, 2nd its easy for hidden objects under the snow like old tracks, hard drifts, trees etc to put feeback into the bars and is somewhat hard on your wrists when not expecting it.
Lastly is weight. It doesn't weigh a ton more, and certainly does not feel heavier when riding it, but when it time to dig out you can tell its there.
Overall, I am surprised at how much I enjoy the sled. It is a blast to ride, but does suffer some when it gets steep and technical. It does seem to not cut through the snow as easily as the Axys chassis, so it doesn't really run away from the 800HO Axys in the deep pow.