I have used them in Greece, on their respective online site, repeatedly and for expensive tire sizes. Never had problems using a credit card and delivery has been speedy. I even got a call from Germany once (by a lady who spoke Greek!) to ask if everything was delivered ok.
As mentioned already, it is a welcome bonus that their tires are fresh - e.g., three months old. (Tech note: A tire deteriorates with time, even if it is just sitting at the shop, unused. Of course, this is not to suggest that a year-old tire would be dangerous.)
I can't say if their Swiss sites (reifendirect.ch and 123pneus.ch) offer comparable service but it should be a safe bet since the same (German) company,
Delticom, is behind all
their online stores.