Over the past few days I've posted reviews from both myself and forum regular Ugly Bob for Distant Worlds I and Distant Worlds II.
UB finds the first album release "an amazing collection... as essential for new fans as for the ones who have been with the series since its inception", but the second "an average follow-up to the superlative first collection", which seems to be in line with many of the reviews I've read.
Personally I'm of the complete opposite opinion, finding the first release a quality collection but with questionable value to long-time fans due to its many rehashes, whereas the second album has not only a better selection of rarities for collectors but is simply a more impressive musical experience overall. I can see how a few horribly flawed arrangements (the vocal tracks and "Dancing Mad") could obscure its overall quality though.
Anyway those of you who have yet to acquire one or the other album feel free to have a look at the reviews and a listen to the samples.