I found Perry King (the voice actor for Solo) to be one of the most "off" actually... along with Brock Peters (the voice for Vader). Nonetheless I've been enjoying these dramas too since I acquired them. It's quite cool to experience Star Wars again in a new, slightly different, and expanded way. My only problem is that I like listening to them as I go to bed, and I keep falling asleep during Episode 6. I think I've listened to Ben and Luke go into Mos Eisley about 20 times now.

And yes, Ann Sachs does a very impressive Leia... almost as impressive as that Mark Hamill guy doing Luke Skywalker