The preferences for Xpress mugs is interesting - my fear is that they are not dishwasher proof:
"Dishwasher resistant up to 800 wash cycles at 45°C."
Do you tell your customers to only wash at 45C?
I ask because when I look at mug reviews on Amazon, a frequent complaint / compliment about the mugs people have brought is around them fading/not fading.
My thought was to go for BMS European because of that.
I've been told LW are good against dishwashers, but from this threat it sounds like there is a cracking issue.