I have zero Snap-On, but I'm only a pro mechanic part of the time for a very specialized field so that barely counts. That probably makes me not a pro mechanic.
I have Proto, Armstrong, CDI (well, same group as Snap-On), Bahco (also Snap-On group), Knipex, Wera, Wiha, Facom, Felo, Hazet, Beta, Stahlwille, random other stuff. I'm a believer in getting stuff I like, not getting everything from the same brand just to have the same brand. Snap-On sells some good tools, and some crap ones too (like some shitty screwdrivers with good tips and horrible handles).
I know NASCAR mechanics who use Craftsman, or a mixture of stuff.
The high dollar boxes are very heavy built, but you are laying for the name too. Having a $8k box doesn't make you a better mechanic though, so I don't get it.
What were we talking about again?