I've been to Hyperbowl twice now, both times the day after a big dump of snow, and both times as part of a visit to Sky Valley. Once was nice and sunny, the other snowing with nil to little visibility. Both times it was a great resort to be at.
Hyperbowl and Sky Valley share a lift ticket, and the mountain. At the top of the mountain there is a rope in one place separating the two resorts, but most of the way down the mountain there is nothing to tell which resort you are in other than the lifties uniform.
The bottom part of Hyperbowl is amongst the trees, while the top half is open and exposed. this does mean the top half is subject to a lot of wind, but also means there are unlimited courses down the mountain side.
As I visited via Sky Valley I can't say much about the base area. However the ticket office was by the bottom of lift 1, and there appeared to be plenty of parking close to the bottom of the lift, and also close to the bottom of lift 4.
Lifts 1 and 4 take you up though the trees to the side of the mountain. Lift one being the longest, form the top you can ski back down either the courses under lift 1 or lift 4, over to Sky Valley, to lift 2 to go to the top of the mountain or to lift 3 which takes you halfway up the mountain. All the lifts are doubles.
There are plenty of cross over points to Sky Valley, from the top of the mountain (top lift 2) there is a nice cruisee run over to Sky valley and down the mountain enabling you to zig zag back and forth between the two resorts. From the top of lift 2 you can also come straight down though nice open terrain, that had plenty of powder areas the days I visited.
Lift 3 also gives access to Sky Valley and the open areas on the mountain.
Lift 1 and 4 drop you back down towards the base areas, both wide and groomed with the area under lift 4 having a number of jumps on the side. It is also possible to switch between the two runs as you go down.
SnowJapan lists Hyperbowl as having 4 lifts and 9 courses, but if you combine with Sky Valley you get 9 lifts and 17 courses. A nice big resort, with enough terrain to suit all abilities. Assuming the visibility is good the top half of Hyerbowl offers as challenging a run as you wish to make it.
I didn't eat here, but there were a couple of interesting looking cafes besides the run under lift 1, there is also one restaurant near the top of lift 4.
There were no facilities for non skiing/boarding kids, but the ski area was much more accessible than at Sky Valley
Combined with Sky Valley, Hyperbowl makes a great place to visit if wanting to go skiing when in Kansai.