I'm a snowboarder, it's pretty nice if you remember to adjust your clothes for the day. Definitely a loose jacket for me & t shirt weather. Around 10-12 is really nice and soft!!! Falling doesn't hurt at all. I widened my stance and set the angles duck & it made a huge difference.
Yes, slide bowl is open top to bottom. However, only big bonanza and a couple other groomers looked like they had good conditions. There are some soft moguls on other runs on slide side if you don't mind dodging rocks. Get there early in the morning if you like slide side.