I've been to the Glass Center perhaps 5 or so times now. I've gone for a tours/demonstrations and two "Make It Now" classes. I have thoroughly enjoyed going each and every time. Some of the art they have on display is fantastic. It was interesting the last time I went because local artists were there to sell glass work they made.
The Make It Now classes are well worth $25. You get to be somewhat involved in creating the object (You get to pick the color, blow the glass, and do a couple of other things. You never get too hot to the ovens or do anything dangerous at all. If you want to be more involved, there are other more advanced classes that you can take), plus you have a wonderful piece of art to take home! I've made an ornament and pumpkin so far and will be making a flower soon. The instructors have all been very nice and helpful as well, making the experience even better.
I can't wait to go back!