It is high, but I think it's worth it. We've been a part of the private Alpha and it has the potential to really improve a lot of the design process. It already solved a lot of problems we've encountered in sharing design files and gathering feedback between designers, and it's basically v1.0 right now. Can't wait to see what they come up with to improve the product.

Also, you usually have a lot less designers on a team when compared to developers. And I like the fact that you pay just for the actual designers who collaborate on the files, and the viewers are unlimited.