You will love it and not look back at a sled, wishing you were still there.
Bottom line, it takes much less effort and work to get around on a snowbike, in off camber and deep snow, than a sled. I rode with a couple just a few weeks ago, she was the one on the snowbike, he the turbo Yammi sled. She could go anywhere "the guys" went, but without fighting her machine on the sidehills and gullies.
In my experience doing demos, there is fear of leaning the bike, because of the falling sensation. Leaning is actually how the snowbike turns.
Most important technique to practice is, leaning your street machine over to make a slow u- turn in the parking lot. Getting a feel for how much you counter balance the street machine with your body above the bike and bike leaned under you, in that slow u-turn, will let you carve a snowbike like a pro. Snowbike carving is all about trusting the lean of the bike, plus hitting the gas hard enough to get the turn done so you dont fall over, just like on the street. It takes more whacking the throttle and track speed, on a snow bike to ride powder, then you are used to using, for street or sledding. Dont fear the throttle in snow, it is your friend and "rescue handle" when you feel the snowbike leaning too much for your speed and about to fall over.
You already know how to ride snow, you know how to lean a bike, combining the two will take about 15 minutes until you have a good feel and can rip it up. Trust yourself and your experience to do a good job, because you will!