For solo gigs, I rely on the Tyros harmonizer quite a bit. It does take practice and I've modified four harmonies that I keep in user files, that I use.

The harmonizer doesn't take the place of real harmonies, that's why when my wife and I sing together, we don't use it.

But for my solo gigs, the harmonizer adds a bit and makes the song more interesting for the audience. At least that's the feedback I get.

My wife can't use the harmonizer as she belts out songs and over drives the harmonizer. But we don't like to use the harmonizer anyway when we do our duet.