I found that they worked well early, but have mostly lost their power. I think I might try them again, but tweak the length of the work and break cycles - maybe longer cycles of both. The problem for me is finding something to do that works in 5 minute chunks that's both relaxing (not work) and energizing (gives you the ability to work more), but isn't so compelling that you take an extra long break to keep doing your break activity.

I find that, even if I mostly ignore them, I still work more and better with Pomodoros. But my baseline level of work is pretty bad.