Eugene – yes, I bought some Raimondi (Italian) ones. As these tiles are dead flat and will show up any horizontal misalignment, I thought it best. You tighten the clips up with a special tool – this clamps the top surfaces of adjacent tiles to the same level and afterwards you kick the clips away and grout over the join. Obviously you need some give in the adhesive. It could still go horribly wrong!
I've already used self-levelling screed to get the floor very close to level, otherwise the cost of adhesive could be a problem. The first tiles down will get a lot of attention from the laser and spirit levels…
Murray