^^ Better than ginger imho, and to a degree it definately helps, its not a panacea though. I've heard others report similar affects as well.
Never had ondanserton, but cannabis is out of the question most of the time when i'm tripping, though its pretty effective as an anti-emetic.
I've heard a few people say leo (lemon essential oil, not law enforcement officers lol) works wonders with 2c-e, and i've tried it with 2c-d, 2c-t-2, 2c-i, allylescaline, mescaline, extracted harmalas/dmt, mescaline/dmt, and a bunch of 4-subb'd trypts with pretty consistently effective results. Most of the time now i just don't need it as i don't dose as high as i used to, so nausea is pretty manageable if i have a relatively empty stomach, and wait until i'm peaking to eat something if i'm hungry.