Anthony has many talents, and I suppose it would be a little unfair to compare to his other releases, but if you don't it's harder to get a sense of the relative quality of the material.
"Sides" has some truly fascinating material on it, although the consistency of quality does not always rival "Wise" or "Geese." Still, if you yearn for more vocal-based AP tunes, this is the next best thing after "Wise." While "Invisible Men" stretched towards mainstream pop, and "Wise" went for the genesis-prog crowd, "Sides" takes the middle road and succeeds very well with that balance.
AP uses other (and much more skilled) vocalists (sorry, Phil Collins does not appear here) quite effectively on pieces such as "Bleak House," a piano-based ballad with fine, balanced accompaniments, and "I Want Your Love" a mellow pop tune, both that are among his finest works. The melodies are superb and memorable, while the lyrics take on more mainstream themes such as love and yearning and away from the fantasy themes of old.
Another in this category is "Lucy Will" which AP sings in a humorous manner that fits the lyric well. His ballads throughout the CD are very strong.
Those longing to hear AP's electric guitar and genesis-type stylings, will be pleasantly surprised on "Magdalen" and the more-electric "Nightmare." (The Magdalen bonus track is a bit redundant).
The bonus track "Souvenier" is a very pleasant surprise.
I found the weakest moments were on "Um and Argh," on which AP's vocals were a bit too grating and the tune a bit out of context with the other great tunes on the CD, and on "Side Door" and "Holy Deadlock" where he tends to stray too far into pop-land. Even so he does make them fit more comfortably than on "Invisible Men," and even the weak tracks are not unlistenable.
All in all, a very satisfying CD.
(P.S. - IMHO, first purchase Geese, then Wise, then PPP I and II, then Tarka, then this one)