Sounds like the last guy is treating them like a normal tile, the first guy is on his own so it would take a little longer but it would be for a little less, and the guy in the middle with a mate will get through the work quicker as he has a helper but he needs to pay this helper so it would cost more on the job. It makes sense to me, apart from the last guy who is either really quick and has 6 hands or would be saying to you in 2 days time "it's gonna take longer than I thought Mr".
I'd say go for the first guy.
Really though, any could end up as good as each other. If the last guy has just done two of these floors then he's laughing as he knows his speed and is confident with that tile combination and his price he's given you and to quote 2 and a half days and not three he clearly knows something the others don't.
The prices are not bad if they include flexible adhesive etc too by the way, that stuff ain't cheap these days.
Still, I'd say the first guy for some reason.
