Yeah you only need to get the shine off. The trick is getting it off in all the nooks and crannies. I just used spray paint. To do the logo, I taped over it and just used my fingernails to make sure it got into the crack at the bottom. I cut out the excess tape with a sewing needle (if I recall) and took a little extra care with the paint to get it in there clean. All good painting is really just good prep work. I did a similar paint job to my T50s, but with a cream and maroon color scheme.
I love the 6XX. My go to pair. I’ve been thinking about getting the 600 or 660s but I’m not sure. I would probably paint the 660s too if I got a pair :P I know it wasn’t too popular but I actually really liked the old 600 color scheme. Kinda sad to see it go haha. I’ve got the exact same setup except I’m still waiting for the 789 to come... how do you like it? I’m excited to try running my T50s balanced too