I've been there before... pick up the demo unit and found many dust on it... I know if I buy, they will give me a new set but u know the feeling is not very good. This make me feel this shop is not very professional and not well-managed.
Also, they suggest me to buy JBL 5.1 set when I ask for this set.
AMP : Denon X2300H
Front: JBL Studio 530 bookshelf
Center: B&W bookshelf
Rear: Minx 20
Subwoofer: X300
Old Spk: 2 x B&W DM302