I went to Happo-one on Jan 26 and had a great day. The snow wasn't the best, as it was a little bit warm (3 degrees) but there was still some good deeper pockets to be found in the trees.
I was surprised at how much larger the mountain was compared to the other Hakuba resorts. You could definitely spend a few days there without getting bored of the terrain. The runs were pretty long and the grooming was excellent.
I had heard that Happo was often quite packed during peak season, but I guess we were lucky as we never waited for more than 1 minute to get a lift.
If you don't mind a bit of a walk after your run, there is some amazing tree riding and powder stashes underneath the main quad chair on the riders far right. Just watch your head when your walking out as you need to duck under the chairs!
Boarders should avoid the top lift at all times. There is nothing but crappy moguls up there and no way around them to get back down.
The India Cafe's on the slopes are very friendly and make a great coffee, but have pretty crappy food. Make your way down to the area around the gondola for a decent meal.
I would have loved to ride Happo with some pow, but even without it I'd still recommend the place to anyone coming to Hakuba.
Some tips for other resorts
If you want to go to Cortina (a must on powder days) the best way is to get a train from Hakuba or Goryu to Minami-otari then get the free shuttle bus (it's green with a hotel name on the side) to the resort.
The best riding there is out of the backcountry gate at the top left of the resort. Obviously don't go out there without the right gear, but it's really simple to get back down to Cortina lift 6 even if you don't know where you are going. Just try to stay to the right-hand side of the gully once you get down to the bottom of the main face.
Goryu/47 is a pretty cool mountain as well. My pick of the riding there is the club tree zone at 47. To join the club you just need to go down to the ski school and sign a waiver. It didn't cost us anything which is a nice change from other resorts.
From 26 January, 2015 To 01 February, 2015
Snow condition on visit:
5-10 cm fresh snow (heavy due to temp)
Things I liked:
-Huge range of terrain -Pretty relaxed with boundary rope jumping