First, I'll need more days on the slopes in different conditions to properly write a full review. I will, however, write what I can based on 3 full days on the mountain under extremely icy conditions and zero natural snowfall (lake Tahoe, early drought season of 2011-2012)
I am an all mountain rider and my prior boot experience is the Ride Deuce mountain-freestyle boot (for newbie flexible comfort). I have extremely flat feet and I always use my Superfeet blues inserts over any insert for any shoe/boot. I have about 30 full days on the mountain and my goal in getting this boot was to have an easier lacing system, a stiffer flex and to go up a half size as my toes were getting jammed.
The Maysis boots are extremely light compared to the already light Ride Deuces. My previous boot was already a lightweight boot but the Maysis just takes it to a new level. This is almost strange as they are considerably larger making it a slightly more difficult to fit into my size large Ride RX bindings.
The Boas are nice and really help hold down my heels and really allows the my feet to stay in place. The front boas has a bias towards your shins. Not a big deal as my feet are already very well fitted inside the boot. I also dislike the placement of the front boa. It always gets in the way when strapping into my bindings. This reason alone is a big enough annoyance for me to dock a star from its rating. Something to really consider if your ankle binding strap has a wide cushion.
I found myself riding significantly faster then my previous boot and better able to carve in the icy conditions. The speed increase is definitely due to icy conditions but better carving can be attributed to having more stability in these boots.
So far I can still recommend these boots because I love its light weight, dual boa system and improved stability. I have another trip planned where there is expected to be several feet of fresh pow so an update will be in order to see how they handle better snow conditions.