Well, I don’t know what is the real W of that laser diode, but it does show in video that it cuts 8mm plywood in single pass and 3mm with 400speed/min so I am happy with that. Now I have a 30w neje laser attached to my Rotrics arm but I need to cut faster, engrave faster. I need to cut 3-4 mm plywood but mostly will be engraving. Is just a hobby for me and try to sell a few things that I make. maybe later in time I will get a co2 laser, until then that laser from Aliexpress looks perfect :D. Normally I wanted to buy the 40w Nejes master 2s max ( I know the optic power of that is 15w). But after that, i thought … why not build my own machine so I can use the laser that I want and add a spindle that I can use to engave and cut the acrylic/Plexiglas until I will have the space and money for the co2 laser. Yes I am from Romania 
and thank you for your fast reply.