I've been to VN. We stayed in one of the north-facing (sunny) rooms with a balcony at the mid-grade Puerta del Sol. We're headed back in late-August/early September for 10 nights if it ever snows down there. You can easily stay at the cheaper hotel since all 3 hotels share the same restaurants and common areas. For 10 days, we opted for the somewhat bigger, nicer room with the sunny balcony. It's still inexpensive compared to any slopeside lodging, meals, and lift ticket package I've ever seen in the United States. We're going with a group so we get a discount on top of the discount they already offered on rooms when it's not their peak season.
My last trip, they got 11 feet of snow while we were there and the conditions were superb. The terrain directly underneath the lifts isn't all that challenging but you can traverse-to, hike-to, or take surface lifts-to as steep as you want. VN interconnects with two other ski areas so you have an awful lot of terrain at your disposal. You're sleeping at 9500 feet and skiing above that. It's 100% above the tree line so flat light days are very much ski-by-brail.
There are only a few hundred rooms between the 3 hotels plus some condos. The architecture is very much like one of the purpose-built French ski resorts with lots of brick, concrete, and glass. You're 2 hours from civilization up a long switchback road. There's an armed road block halfway up the road so the place is pretty insulated from issues like petty theft. The staff is there on 4 or 5 day shifts and is bused up from Santiago. The food is good to excellent. Everything is included other than a small surcharge for some premium entrees at the restaurants and beverages. The restaurant selection includes Chilean, Swiss, American, Italian, French, and a Sushi bar. You can get by with English but a few survival words in the restaurants is helpful.
The mix of people seemed to be roughly 1/3 national ski & snowboard teams, 1/3 Americans, and 1/3 people from everywhere else. The 1/3 from everywhere else tended to party late & sleep in. On a trip where virtually every day was an epic powder day, we opted out of the night life most of the time.
I've also been all over the South Island in New Zealand. VN is much bigger than any of the New Zealand ski fields. In NZ, you don't have lodging at the ski field... all the beds are 20 minutes away down in the flats with a drive up a dirt switchback road to get to the snow and the lifts. In NZ, you're not trapped at the resort and it's easy to wander around and do non-skiing things. Of their ski fields, I thought Treble Cone had the best terrain. The front face under the 6-pack lift is low-expert. Off to the side, there's a double chair to surface lift to snowcat that lets you get to some very interesting natural half pipes and baby chutes. I also liked Mt. Hutt. You mostly skied a big loop of double chair to quad chair to T-bar to get to the most interesting terrain. Queenstown is the only resort town on the Island but the two ski fields nearby, Coronet Peak and the Remarkables, aren't quite as interesting but they're worth a few days. I also hit the Ohau ski field which is a 1000 vertical foot slope serviced by a diesel T-bar. I caught it on a powder day and had some great retro skiing. If I had 3 weeks, I'd rather go to New Zealand. With a week or so, the access to Santiago is much better since it's in the same timezone as the eastern US and it's only 8 hours from Miami. I'm already planning a New Zealand trip for next summer when I have accumulated enough frequent flyer miles for a couple of business class tickets.