My girls went to the one @ CU Boulder recently and enjoyed it. It was their first time hosting a Splash program so there were definitely some organizational issues and their #s were smaller than they probably will be in future years which led to the microbiology class that dd13 was really wanting to take being cancelled at the last minute, but...
It was fun none the less and we'll likely try it again. The one @ MIT sounds great and a two day program w/ a parent program as well sounds quite awesome!