Sprit3-Most comfy boot ever for touring no question. My feet feel way better in these after all day walks than say my old denalis. However I feel the boot is a bit too squishy and the liner not thick enough to provide efficient power transmission to ski. I have had to back off the speed on a few lines this year to regain control. I also had to adjust the buckles alot to dial in the stiffness, which I dont normally do with my boots.

I cant wait for the new Intuition liners I think the rubber sole will take up some volume for me and give me a bit less slop in there.

Spirit4-So far It definitely skiis better. I do NOT think the plastic is stiffer than the sp3 although I have heard different. Exactly the same shell and pebax. However the subtle difference the extra buckle provides is noticable. Less rebuckling and the stiff “ski” tounge works way better on the way down but is a bit akward going up. (No big deal for short days) The big difference is that in variable snow this boots makes skiing way easier and fun. The buckles on these boots seem to be overly thick and I think could be lower profile. You end up with what looks like alot of metal on top of your foot, which collects wads of snow.

First of all I have low volume feet and narrow ankles. The MegaRides have a fairly square heel box that left my boney heels a blistering nightmare. The Spirits conform well to my teardrop shaped heels and the Heel Retention System (HRS) really does work. No more blisters! What is not to love!