What makes you think no one had good results? I've been using the A6 for a year and have been amazed with how effective its been.
I've pretty much followed the approach used by @74775446, which is effectively 6 passes at 2mm (applying no pressure), once a week I haven't paid much attention to...
I've been shocked with how effective micro needling has been. I've done 2mm once a week for about 9 months. I use about double the amount of minoxidil as directed (3 ml plus per day). I'm trying to figure out the right frequency for the long term and am wondering if you can get better results...