We recently did 3 day PTing, and were pretty successful. He still dampens the fly of his underwear a couple times a day, but then fill the potty, and never a full accident. We're just stalled on the poop thing.
At least we're in underwear FT now, even if there are a couple wardrobe changes a day.
The other thing is, I read that the author of the 3 day thing doesn't consider damp underwear an accident because they stop themselves. I get that, but I'd like it to go away soon! It's only about 2x a day now though, and I don't think it'd even get his shorts if he were wearing them, but we stick to just unders at home so I can catch the damp ones.