I joined this club before and found that most of the coupons are not so useful.
Actually, a lot of credit cards offer discount on these hotel so I don't think it is worth.
I join Marriott Tung Chung this year because it has a free hotel room, wine, birthday cake, $6 x 100 cash coupon and 14 times members' free discount to dine in its hotel + 16 times members' free discount in their Asia Pacific hotel (not include Marriott Admiralty) but the fee is only $1,888. The value of the coupons already exceed the fee so I join it.