The classic dilemna for any writer is how to follow a masterpiece. After the 'Chronicles', Weis and Hickman could probably have got away with recycling the same material for a few years until the readership finally lost interest. Thankfully, they didn't. 'Legends' is what a good sequel should be: it takes established characters and themes and does something new and original with them.
In fact, 'Legends' is really both sequel and prequel to 'Chronicles'. It focuses on a smaller group of characters than the first trilogy (Caramon, Raistlin and Tas) and spends a lot of time establishing the "backstory" - the history of Krynn that was hinted at but never fully explained in 'Chronicles'. If the theme of the first trilogy was the balance between good and evil, in this one it is the difference between destructive and ennobling love. For all the intricate plot, the real story is that of the relationship between the twins, Caramon and Raistlin.
As with the annotated 'Chronicles', this edition is excellent - better, in fact, as it contains more bonus artwork than the first book. The annotations often repay reading, although for the sake of continuity I often tended to skip them while reading the story and come back to them later. Once again, though, they contain plot spoilers - be warned if you are reading 'Legends' for the first time.
I can't recommend this trilogy highly enough. It helps to read the 'Chronicles' first, but both of these books are essential reading for fans of sword and sorcery fiction.