Has anyone had floor sanded with a dustless remover of finish? How does it compare to the traditional method?

I've gotten quotes from flooring contractors using either dustless and traditional stripping machines. The traditional machine users say the dustless machines aren't really dustless and there is no advantage. Of course, those who have invested in the dustless systems say dustless is cleaner; their quotes are often higher.

I'd love to hear from people who have experienced both methods.

It does take more time to set up and work with a dust less system. I find that there is usually plenty of dust to go around on the job before we get there, cobwebs, etc.
Any dust left on the job is free dust! Dust is the responsibility of the contractor,cleaning up floor, walls and anywhere the dust may settle or had settled before the job started. Great marketing gimmick to have on your van!
I have tried this technique at a machine demonstration. Not dust free.