Just started playing with this one.

Initial impression is negative, if only for the fact that it doesn't automatically merge plans that are clearly related. eg, I sent it flights, then 2 sets of hotel plans that were within the days of the flights. TripIt and Kayak both merge all 3 plans into a single trip, whilst TripCase left me with 3 trips all with the same name and overlapping dates, but I had to manually merge the three into one.

As someone that normally books airfares, hotel and car separately, having to log into the website to merge the trips is a showstopper.