Visited Mt. Jeans in late December, 2008, on the day after a snow storm. I think it may even have been their first or second official day open of the season, due to a late start waiting for snow that year. It was a beautiful, sunny day.
The resort is very easy to get to by car, just 20+ minutes off the Tohoku Expressway. Quicker to get to than Hunter or Edelweiss even if coming from the south,
I've lived in Tochigi for a few years and never bothered to go after hearing nothing special from people who have been there. As I wrote above there is a very handy shuttle bus service. But both times I have been its been real busy and with only a small handful of runs and slow lifts it wasnt an action packed day. Mind the waits were only a couple of minutes. They closed the gondola when it got windy on