I ordered the Air Assist for my M1 and found it to be extremely well packaged and quality of the equipment is excellent. I thought the price was expensive, but as the nozzle and connections couldn't be purchased from a 3rd party (that I know of), the buying the air pump from Amazon wasn't an option. That said, you get 2 nozzles and 2 spare lenses. Setting it up was relatively easy, especially after watching some Youtube videos as well as using the intstructions, but struggled with getting the hose to sit correctly without blocking the camera, scraping the laser box lid or jamming behind the Y axis on return to home. However, you need an air assist when cutting, so bit of perseverance goes along way. However, improvements I would ask Makeblock to make would be:
1. Make the hose less rigid
2. Make the air pressure adjustable, as some materials require air assist, just not full force.
3. Provide a cover plate to replace the one removed to fit the nozzle.
All in all a good purchase.