Queued at 2.30pm managed to enter 15 minutes later, line was moving quite fast but ... had to wait more than 30 minutes to get into the fitting room!

And they require you verify your vouchers at the entrance before you can use them, I was required to show my ic.

I didn't try cause they were promo items to which those vouchers can't be used on.
But only the 002 UJs were on promo so I guess you could still use the voucher on the other types.