The Collette tour went well. I would recommend this tour to anyone who wants to see a little more of Eastern Europe. I think it was good value for the money, Eastern Europe seems to be quite a bit cheaper than other parts of Europe (excluding Berlin and Vienna which are more expensive).
Prague was really crowded at the major destinations eg the castle and Charles Bridge, it's a trendy youth destination it seems. I enjoyed all the other destinations however, especially Berlin which has its own vibe, Budapest (fabulous hotel overlooking the Danube), Krakow (less fast-paced, more quaint) and Warsaw (interesting, friendly and diverse).
It is a quite fast-paced tour, but the attractions and options they include are all good, as are the hotels, mostly excellent in fact. The only hotel I did not like was the Mecure Grand Biedermeier in Vienna, because I had a single bed with a particularly hard mattress. All the hotels were located very close to the "Old Town" parts of the cities which made getting around on your own very easy.
There were only a few Australians on the trip, it was mostly Americans but all lovely people and a nice group of only about 22. One elderly gentleman struggled quite a lot with walking distances, steps etc so probably not a tour recommended for less mobile travellers. There was quite a good variety in locations and activities, plus free time included.There were other singles and we did some things together which was nice.