So, you've done sprinkles, dipped cones, sauces and all that - what makes this place different? You get to design your own treats - and they mix the treats you pick into the ice cream (hence the name)! This adds greatly to the variety you can get, as well as just spicing up that hot summer day's cone with something new.
What other reviewers don't seem to have mentioned is that this place is a local must-visit spot on the Ave for anyone living in the area - according to a friend who works there, sometimes new student tour guides even bring groups of new UW students there while showing them around! I think everyone who has been in the U-District for more than a month knows this place.