I visited Hunter Mt on a day trip package from Tokyo for around 7500 yen from JR. Access with Shinkansen and bus from Nasushiobara was simple and a bit over 2 hours from Tokyo Eki.
The morning had beautiful crisp, clear weather and the snow was firm but not icy. I was surprised how few people were on the slopes for a sunny Friday morning. I didn't wait more than a couple of minutes for a lift all day.
By lunchtime I had skied every run at least once - so the place is on the small side. I soon discovered that the boarders were more concentrated on the lower slopes (where the jumps and half pipe etc are) and the only boarders on the top half were serious carvers who didn't make unpredicatable turns or get in skiiers way by suddenly sitting down for a smoke :-)
The run beside the double lift right at the top is a great one for working on technique and turns and had some nice soft snow at the top. It's not long, but fast, fun and uncrowded - and I got straight on the lift every time.
Top to bottom is a decent length run and kept me happy for most of the day - until the wind picked up, clouds moved in and temperature dropped sharply forcing them to close the gondola.
The express quad lift that goes almost to the top, then the twin is a good option if the gondola is crowded, closed or running slow because of the wind.
Overall, I would go back if - as the other day - the weather forecast for Nigata/Nagano is bad. Being closer to the Pacific coast means its weather can be quite different to the more typical (ie Yuzawa) day trips from Tokyo.