i have used them and i think they are pretty good, what ever makes the job easier is fine by me and as long as your 1st m2 is level they do help speed up the rest of the job and i dont need to use my level n mallet as much on rec porcs..a 12mm Trowel is something i would use for larger formats anyway that and a back buttering especially over UFH, no matter what advancements are made in tools the tile n adhesive will always be heavy work and that will keep a lot of folk away from tiling,
has anyone seen the rubi system now that is expensive! it looks like a rip on the tuscan system, the raimondi system looks good and i have heard that it works a treat but still a bit costly the only problem with the lash is a Sore Thumb.
makes me wonder what tilers thought about thinset when it came out they probably said it takes away the skill level and makes tiling less of a trade, you could go back and also say the same about mixer drills wet saws mosaic on a matt etc..all of these have made tiling faster and easier but as we know its not just the tile to walls/floors that makes a nice job its the prep work making sure the surface is good to tile on now thats the skill