I’ve successfully used VeriFLY as recently as December in EDI. Check in agent said almost no passengers used it and she was happy I had it.
overall agree process does feel a bit bargain basement. I’ve travelled with ten cases back when you had to take them down by the easyJet desks and that was a pain.
Good news is that soon(ish) you’ll have the option to skip it completely as from what I understand EDI Airport are taking over the private Ga terminal from Sognature and are teaming up with Edinburg Executive Carriages to offer more of the skip the whole terminal package where you get driven to private terminal, check in there and then driven directly to plane on tarmac. I’m very excited to try this out when it becomes available.