Pros: Exellent offpist
Cons: Narrow slopes
Gaustablikk offers very good offpist skiing; when the conditions are right, with plenty of snow, you are able to ski through the trees all the way down to Rjukan in steep/very steep terrain.
The resort has seen heavy investments the last years, and they plan for further expansion in the near future ( Plenty of virgin terrain ).
Some of the slopes are a bit on the narrow side and can be quite challenging. The longest run is 3500m.
The real deal here, however, is the Gaustatoppen, the highest mountain in southern Norway. A now defunct nato installation has provided a tramline ( actually two - one going deep inside the mountain, the next taking you up to the top ) to provide easy access to what many top skiers ( e.g. Ketil Andre Aamot ) claim to be the best ski area in northern Europe. On a clear day you can see 1/6 of Norway from the top. Gaustatoppen "tramline" is open when the conditions are right, normally late in the season (mid February - mid June). If you are a die-hard AT you can trek up and save the nok 350 the ticket costs.
When I ski this area, I stay with friends who live in Rjukan. It's only about 15 mins by car going up to Gaustablikk. There's also a free ( at least it was last season ) bus taking you up and down. Staying there, I take my afterski in the public indoor pool, nothing like a nice sauna or steambath to soothe those tender muscles after an action-packed day.
Gaustablikk is most often the first resort to open in Norway, normally mid October (has been since 1990) and among the last to close. Many WC skiers practise here before the season starts.
Good cross country skiing and absolutely not crowded ( avoid easter )+ friendly locals ( as is the fact in all Norwegian resorts ). Gaustablikk is situated in Telemark county.. ( if you ever wondered where TM skiing was born, it's in this part of Norway ). The WW II movie "The Heroes from Telemark" with Kirk Douglas was shot here.