I'm currently reading The Han Solo Adventures by Brian Daley, and I've finished the first two books and am currently on the third.

Han Solo at Stars' End wasn't all that engaging, though it picked up enough at the end to make it worthwhile, while Han Solo's Revenge was the complete opposite -- the story engaged me at first, but it floundered and fell flat at the end.

Overall, they're decent stories with decent characterization, and they succeed at making the SW Universe feel larger by taking place in regions beyond the Empire. But unless Han Solo and the Lost Legacy proves to be a truly excellent story that makes up for the shortcomings of its predecessors, I won't be keeping my copy of the book.