Steep Terrain, true alpine, and good trees.
I only skied at A-Basin four days but was able to experience most of the mountain. Skiing with a local helps. If you like fast steep alpine groomers you will enjoy the top to bottom runs. If you like steep deep skiable trees you will also enjoy this mountain. Some of the most complicated in-bounds tree skiing I have skied. I need to go back to see what the new back bowl has to offer. If you ski Colorado you must stop at A-basin, nothing like the other Summit County Resorts, because Arapahoe is not a resort it is a skier's mountain. Highest skiable resort in Colorado, "Be High, Be Happy".