I've used it quite a number of times, including the High Life Cafe. Only once has it not been "found" on a short haul Gatwick flight. Although i just dont think any of the crew had any idea that it was such a thing, which is a shame that they're not all trained up on the service/offering. The High Life Shop team instantly sorted out my refund though and were really good at replying quick via email. Theres some really good deals on to be fair and the duty free probably beats the airport prices at the minute.