I also make an edit to my previous post but I think you were replying at the same time 
The whole tread is about this. 0.4 prints better and faster than others. 0.6 and 0.8 print badly even if the speeds are reduced.
Do not get me wrong. I am not a frustrated customer trying to rant or trying to start a flare. By no means have any intention to piss you off either. I am just a poor hobbyist trying to understand if my investment in 0.6 will worth or not.