I like a big sound so maybe my liking for the 20.1s is coloured by my preferences The Summits produced a very tight but smaller scale of sound whereas the 20.1s produce a very large scale and powerful sound.
This is so true, and is one of the main distinguishing points between the Summit and the Prodigy, as well as the Maggie 20.1. The smaller panel and more compact size of the Summit simply can't produce a large scale image like the Prodigy or the big Maggie can. The Maggie is really good at this. The 20.1 produces what seems like a huge wall of sound.