Forgive me for going a tad off topic, but I'm about to be issued a 'Swift' card loaded with a monthly west mids n-network pass. Do these use a similar technology to "The Key"? My question really is, how likely is it that we're going to see the same problem in this thread occuring en masse in the midlands?
The problem I started this thread about is threefold -
1. As NajaB says, there's inherent limitations of the card technology itself (ITSO is slower to scan than Oyster... the extra couple of seconds may sounds utterly trivial, but believe me, when you're in scrums of hundreds of people trying to get through TfL Underground barriers or swiping onto a London bus, those extra couple of seconds before the card validates can be heart stopping. However I agree with NajaB that the technology itself is basically OK and "works"
2. The software logic the train operator has built into their particular implementation. In GoviaTL ("Southern")'s case, this seems fundamentally broken for some scenarios. How well your TOC has done their system, you'll soon find out
3. How the TOC's staff provide support when problems occur (as they inevitably do, to some extent, in any system).
In GoviaTL's case, this aspect is absolutely lamentable, bordering on the Kafkaesque, turning simple IT problems into multi-week epics of woe for the customer.
A fundamental problem seems to be lack of "buy in" to the technology amoungst their uniformed staff on the ground (ticket desks, barrier staff, ticket inspectors). This ranges from bemused eye-rolling and chuckles about how the Key "never works" and waving customers through, to minor rants about how "we all have been issued with them but they never work", to dismissive and unhelpful refusal to countence any assistance, instead just flat "you have to contact customer services" and intransigent "you'll have to buy a paper ticket in the meantime".
However to contact customer services, you either have to send an email (to which you get a standard autoresponse about the "Unusually high volume of contacts at the moment" (funny, it's been like that for over 2 years, so it's hardly "Unusual"
...) and vague committment to give an initial reply within 28 days... or you can telephone, which typically involves being on hold for around half an hour before you can speak to anyone. Even then, the 1st line customer service staff in the call centre can't sort out key issues, they have to put you on hold again whilst they refer to "the Key team" - usually coming back having only half-understood the problem, which is deeply exasperating when they won't let you speak to the Key team directly...
Again, I don't know what your own TOC's customer service will be like in this regard. I would hope it's better than GoviaTL's...