These are similar to what the sell at my supplier, needless to say I've never bought them.
Not once have I seen them tamp the floor down or check for level, and how are you meant to wash the joints out??
Absolute wast of time effort and money, definitely not a tiler if you you have to use stuff like,
Tiling is a skill you hone over years not a process!..
I agree with @Ray TT @ Porcel-Thin i could tile faster than them 3 and labour on myself
DIY, DIY, DIY
I reckon they would be useful when working with large format on stud walls, you know what it's like when you try and push tile back and the wall flexes push one corner and the other ones pops up.
Never used them myself but I thought I may give them a go at some stage.
My tile supplier has asked me a few times if I have any interest in using them and I have always said they are for clueless muppets that can't do the job.
Think they could be an addition to the tool box especially with some of the crap building practice and porcelain about.