Used the machine today for the first time in my local Lidl, with a week's worth of Re-turn branded recyclables (about 2:50 worth). No issues at all, worked smoothly, even with a couple of cans that had gotten the 'Jaws crush'.
It was a mild inconvenience. I'd rather not be paying the deposit and just putting them in the recycle bins as before, but I understand that loads of people have just not been bothering and that there is a need to incentivise. Bad for me, but I can live with it if it moves the needle in the right direction. I've been amazed for decades now by people's refusal to recycle, or just dump recylcable stuff everywhere, including in their black bins.
Forgot to redeem the voucher against my subsequent purchases! But it's still in my pocket, it will eventually get used.