My personal opinion of why the DNA60 chip has been so popular is the compact size means it can fit in small mods and the fact it works well, but its Achilles Heel is the cumbersome navigation of the menu. If you use anything frequently you become familiar with the menu but this doesn't justify doggedly sticking with it for so many years.
When I bought my first DNA60 device three years ago there were very basic instructions, one particular gem was showing how to select TC. Unfortunately the method to exit TC, which wasn't included and despite trying every combination of clicks I was stuck in TC like it or not. My first reaction was to watch Youtube vids to have the menu explained and watched many, many vids where the reviewer just said 'everybody will be familiar with the DNA menu by now, so I won't bother'. Of course you can join the Evolv Forum and ask for help - in my case I was helped by a member on this forum.
Because I don't use TC very often I wrote written instructions on how to enter and exit TC and put them in the box. I can't remember much about the rest of the menu but know it tends to be by holding the up/down buttons - if it doesn't work when the mod is on, putting it is standby generally works.
Despite having written instructions and being able to muddle through the other aspects of the menu, having to dig out the box and do a bit of homework has ground me down and the DNA60 and 250 mods I own remain in wattage only. I find my DNA75C, 100C and 250C mods perform just as well without any of the frustration.