I tried one 麥精 last month in a school during a school visit. It was sour with some wine taste.. I really regret to have this 麥精 and want to vomit. i remembered the expiry date is also 2007 ga..
Another parent also drank 麥精 and she was fine and drank all.
Luckily I didn't have any special reaction like diarrhoea next day.