We made a special visit to the Glass Factory as it was quite far away from where we were staying. Unfortunately after they took our entrance fee of 500 sek each they then informed us that the glass blowing rooms were under renovation and were closed.
It was an interesting visit and we did learn a lot about the history of Swedish Glass, however the videos were all in Swedish and it would have been helpful if they had subtitles in English. (I'm slowly learning Swedish, but it is a tourist attraction).
I would visit the factory again, but can only gave it an 'average rating' as it was under renovation at the time of our visit.