We've just had a top quality double sided laminate worktop fitted, 25mm thick with the 18mm thick upstand at the back instead of tiles.
Our kitchen fitted has sealed where the upstand meets the worktop, and where the upstand a are mitred in the corners with silicone sealant. I think this looks crap and had been done to hide poor cutting of the upstand at the base (it was cut down from the original 125mm high height).
Has anyone else this type of upstand? How were they fitted? I expected it to be a neat join in the same way the worktops join in the corners.