... There is always a solution and I guess some here can intervene to support my claim.
There are warranties and there are warranties. A few weeks ago, I brought a luxury brand watch in for service under warranty, and they said, yes, the parts and labor are covered, but it will be three months to do the repair.
As you point out, Sinar doesn't offer a "guaranteed" 24-hour swap, which may be what you're looking for.
But I can support Thierry's claim, as I have had an opportunity to "experience" Sinar service, as a slight wiggle developed in my Hy6's revolving handle. After inquiring if this was normal (the reply was that there should be "absolutely no play whatsoever") I was surprised to have been overnight shipped a service loaner replacement Hy6 camera so that Sinar could take my camera and correct the wiggle.
Another service issue around the Hy6 hand strap cropped up during my recent trip to Iceland. Again, the camera remained functional, but as soon as I arrived back in Seattle, Sinar again cross-shipped replacement product overnight. Again, my setup was still completely operational, but Sinar impressed me with their willingness to set everything straight.
Sinar has shown me that they are very serious about standing behind their product, even when my camera gear was operational, they have done everything possible to look after me, right away. They have more than impressed me with their support.
Hope that helps. Best regards,