I finished Tempest last Friday. I found it an enjoyable read, but I'm also a sucker for Jacen and Tenel Ka.
They brought back an old PT character:
Aurra Sing. No clue what the point was in bringing her back into the storyline. She's older than everyone in the book. :/
There was also one point in the book (big spoiler)
where I thought the authors were actually going to kill Han and Leia... but they got away. Meewahl and Cakhmaim didn't make it though.
I give it a 4 out of 5 from me. I got through the book in 6 hours... I think that's a peronal record for me.