MAN is one of my more frequently visited airports. The lounge is a fairly typical paid entry lounge. There are a few snacks and some mildly comfortable seats but don't expect much more. It's really set up as a place to escape the throngs of charter/LCC airlines and tourists MAN mainly caters to.

Cut your time at the airport to a minimum. MAN is fine for a European outstation airport but if you're used to HKG you'll be very disappointed.