Well, as far as I’m concerned, the original editor should be horsewhipped for making a 30 frame project to begin with. I find it amazing how many people there are who consider themselves professional editors when they don’t know basic, elemental things.
With Avid, if you know what you’re doing, it’s quite easy to create a 24 frame project from the get go. One shouldn’t have to convert from 30 to 24. Luckily, in my case, having the original edits off by + or – a frame isn’t a big deal, since the original edits weren’t very good to begin with.
p.s. If you have to convert a 30 frame FCP project to a 24 frame project, you run into the same + or – a frame issues, which is why it’s best to set things up properly from the beginning, no matter what NLE you use.