Not personally no.. and I agree about these subtleties being nearly impossible to detect when used in a scanner, but others are far more picky. For them it might be worth investing a little time and effort into the pursuit of near-perfection. To me, all you need to do laser shows is a beam.. it doesn't matter if it's square, round, line, zig-zag, spiral or whatever.. just a beam with low(ish) beam diameter and divergence and good modulation response..