I just had my first pair done last week. I've always been against them and didn't do it to make them a wet weather shoe (already have those).
I replace the heel rubber and metal toe taps of my shoes about every 12-18 months and this makes a big difference to wearing life but my cobbler talked me in to trying it for 1 pair. I have to say as a former critic I'm really impressed. Good grip and he has done a great job of fitting them flush, and installed new taps over them very cleanly. Prob worth mentioning also that dainite, while good for keeping water out doesn't grip very well on slippery surfaces. Topy grips much better.