"Beware: major manufacturing flaws!"2.5 starson
Pros: stellar sound - unbeatable
Cons: Satellite speakers pop out easily; Subwoofer dies after warranty expires
Summary: The sound quality is amazing, but these were built to be disposable. After 2 years you'll need to buy another speaker system.
While under warranty, one of the satellite speakers promptly popped out. Harman Kardon sent out a replacement satellite but it was a Soundstick I (not II like I had) and it looked totally different, but that's all they would send.
After the warranty expired, the subwoofer began to get fickle. The knob on these go very easily even if the knob is rarely used as in my case. Finally after 2 years the subwoofer quit altogether. HK referred me to an authorized HK repair nearby but the repairer said they had no way to get into the subwoofer to fix the problem - HK designed it so that it could not be fixed if broken.
The subwoofer is a very common problem with these - see the reviews at the apple store at apple.com (the ones rated poorly will tell you the truth).
I will not buy these again even though the sound is superb.