Nothing but great customer service.
When my RST was delivered way back in 2006, the box was damaged and inside the frame had been very badly scratched!
The box and bike had clearly been badly abused by the delivery firm.
Thorn told me to send back straight away and then about a week later I recieved a replacement.
This time box was again slightly damaged but frame looked OK. However there was some swarf under the paint on one of the front forks. It was one of those things that would disappoint on receiving a "pristine" new bike. It probably wouldn't have caused an issue but maybe a few years down the line I could just imagine the paint wearing off that area a bit quicker than the other areas.
Thorn told me I could send back straight away or wait until the 100 days were up and after I'd made my decsion about keeping the bike or not.
100 days later the bike was picked up and parts swapped over to a new frame. Fortunately this was delivered quite quickly and this time in perfect condition!!
Thats what I call great customer service and one of the main reasons I have returned for two more purchases.