As a salesperson, we often get customers come in saying that their tiler reccomended using a different size tile or thickness than the one they have chosen. Often we aren't told by the customer why the tiler has specified a 300x300 or something small on the floor and often we assume that the tiler doesn't know what they're doing which is an incorrect assumption to make, but sometimes can be true! Some tilers will say they can lay anything and others have certain parameters within which they work. I understand that different situations are better suited to a smaller tile and there are movement issues with larger tiles on wooden floors etc but are there any sized tiles in particular situations that you refuse to lay for a specific reason? Good to understand these things as salespeople so we can work better with our tilers.