Żubrówka is definitely not a working-class drink.
It tends to be the one that people outside Poland remember due to the bit of grass in it.
I'd say it's a working class drink; more than that however, it's a summer drink served with apple juice.
sophisticated
Neither expensive nor particularly sophisticated. As I said, it's a summer drink served in ordinary bars.
A bit out of fashion too nowadays.
Wyborowa (that and Żytnia tend to be what I buy) aren't huge sellers nowadays. The proletarian vodkas of choice tend to be Soplica, Bols, etc plus whatever's being advertised most on tv. That or the awful 1906 vodka that Legia fans buy.