I've had DOT twice with good results both times. Dark spots literally pealed off in my hands every time I washed my face. The end result was younger-looking skin with better texture and more even coloring.
The last time I combined it with the "vampire" platelet injection treatment and I healed faster and with even better results.
I was given two pain pills to take for the procedure and it was very doable...not bad at all at any time during or afterward. (You do look terrible, like an over-ripe tomato, for about 3 days and then you keep peeling for another 2 or 3 days.)
As always, who does the procedure is crucial. Mine was done by a nurse who has a big following locally. Ask around. Ask everybody. Word of mouth is the best recommendation.
One more thing: You must stay out of the sun. The discolorations will return with astonishing rapidity if you don't. Wear a hat and sunscreen constantly.