I didnt get my 1st disk brake set up till August. Now I've got disks on three of my bikes! Mechanicals arent as powerful as full hydraulic, thats a given. I wouldnt say mechanicals are masses more powerful than V brakes, just more consistent IE performance doesnt massively drop off in the wet like V brakes do (& I'm a long time ceramic rim user,since 97).
Setup is piece of pi$$. Infact the only vague hassle I've had with disks so far is taking the time to shim hope calipers (more time consuming, not difficult) & that isnt a problem with shimano.