I've never heard a pickup that's as good as a mic'ing up an acoustic. I really hate the sound of piezo pickups.

I would never record using a pickup, always mic the guitar

I can't remember the last time I played in a big enough room, to a big enough audience, to even need to use a pickup. There have been times over the last few years when I've played in noisy pubs and thought it would have been preferable to have had a pickup (than placing the venue's SM58 in front of the guitar)... but then again it would have been preferable to have not played those gigs!