A post in the Rolling Results 21/22 page 45 #898 refers (Southampton-United).
I thought I'd relate my experiences yesterday.
My sister had her ticket loaded on her mobile, while I had a print at home paper ticket as my mobile is basic, and can't support this new method.
The impression given by a video on the OS was to hold your phone over the scanner, and it would admit you; however, she was told by a steward to click on a symbol in the right top corner of her phone, and then scroll down for the QR box code, and then present her phone - I think this worked the second time.
I entered the paper ticket in the appropriate slot, but it didn't seem to work - a different steward took the ticket off me, proceeded to unfold it, and then the scanner turned green to permit entry, a few seconds later.
Either a huge delayed reaction, or, I suspect more likely, a scan using a master card.
Which ever way, no real delay, but something to keep an eye on this coming Saturday.
Plenty of posts on Blue Moon by fans about failures and delays, so very much a work in progress.