The crater is legitimately steep, with some lines over cliffs and other hazards. There's no "easy" way in, but there are some lines with less hazard below. The runs aren't long, but they are dramatic. I like to write, but I really struggle to find the words to describe how much fun this was to ski and guide.
The flanks of the peak are not as steep, but they are much longer runs. We spent two-days shredding long, easier runs in great spring snow. Sometimes stress-free is fun, too. ;)
I'd say our timing was perfect. This is a great trip for very strong downhill skiers looking for a true adventure in the very end of September or early December. Warming up on Volcán Casablanca and finishing the trip with either Osorno or Villarrica makes for a perfect eight to ten day itinerary.