My wife has a 1921 O-18 or OO-18 that I love to play, but my only complaints are the bar frets, which make sliding difficult. If you're buying a new 12 fret guitar, this will not be a problem. My other complaint is that changing strings is a hassle. I can usually replace a broken string on my guitar before the song is over, but hers takes much longer.
She loves her guitar, but doesn't do much sliding nor break many strings.

If you play slide guitar, you won't want a 12 fret. Even though I hate the looks of acoustic cutaways, they are handy for playing slide.