I have the Low roller version in order to get the biggest z distance on my smaller laser but haven’t used it very much yet. I did a few test engraves and it was very easy to set up and level some odd sized wine glasses. Not sure why anyone would think it is complicated but I’m not offended, lol. The knobs make the adjustments for leveling and setting the glass distance very simple and precise.
Mine was comparable in price to the one that was specced by Thunder Laser when I bought my laser and I think they are now the recommended rotary being sold with their lasers in the US. I have the original 7 pin rotary from Thunder Laser for sale at a good price if anyone is interested as I’m keeping this one.