It's a very weird sensation. I went last December with six of my colleagues and the reactions went from totally non-plussed to someone totally freaking out. I was more towards the freaking end of the scale but I just "got into the zone" and tried to forget about the tickly feeling. The initial zoom of fish coming to nibble the dry skin is the most tickly part and if you keep taking your feet out and putting them back in, that initial tickly zoom will keep happening. The results are v. impressive though, super smooth feet afterwards.