I sympathise as I too have a downey face and upper lip hair that I have had since I was about 12! I tried electrolysis on long chin hairs but then they would sprout somewhere else! Now I just pluck the longest ones. My concern with waxing upper lip is that if all hair is removed surely they ALL grow back at the same time, giving the appearance of more thickness. If left to themselves, the hairs grow at different times so are different lengths. Again I now just pluck the hairs that show the most. Part of me says that I have lived through my teens and for 50 years with this problem so why start waxing now? I am also concerned that with a creased upper lip, waxing would be more difficult than on a young smooth skin!
I would steer clear of the Nono. I looked it up some time ago and think there is a finishing off process which sounded a bit like mild sand papering! I recall an emery type mit used to be available for removing leg hair. Maybe this is the real active part of the Nono?
Not fair, is it but I know there are worse things that some people have to cope with