Work well but maybe added difficulty for amateurs.

These do work as advertised and are very helpful when it comes to leveling. But there is a bit of a learning curve if you've never tiled before. You need to make sure they are placed under the tile but above the thinset (mortar). When you break them off, you should do so in the direction of the grout line or it can leave fragments in between your tiles. They can also make minor adjustments difficult when trying to maintain straight lines.

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