The 135 operator I work for has always given us "hard" days off (currently 2 weekends off, on call the third). That said, they have always implied that thay don't have to do that. They believe they could say "If you didn't fly yesterday, it was your day off." We actually are busy enough that, except for the weekends, if you are on call, you are almost guaranteed a trip that day so they have to give us hard days off to meet the regs, and the weekends are slow enough that they figure they only need a couple of pilots on call to handle any work that might come in.
The pay is pretty excellent, but QOL sucks because you work hard for those dollars. If the hard days off went away, they would quickly need to replace a lot of young pilots with plenty of time to move on and nothing to lose by going to the regionals. The most frequent complaint? "It would (almost) be worth the pay cut to only work 15 days a month." We currently work 24 days.