Pretty cheap but not too nasty. It’s a good enough primer, I mean you could definitely find a better one, but maybe not for $6. So you get what you paid for.
As for the tone adjusting: it does not work. My skin is pretty evenly toned apart from some redness around my nose and mouth/chin, and a red patch on my jaw. Green is supposed to cancel out red, but all of those areas remained just as red as before, so not really impressed with those claims.
I really enjoy using the e.l.f primers; they're fairly cheap and work well as a primer. However, I haven't noticed a difference between the primers and they don't seem to be very effective for tone adjusting/fixing redness/etc.
They apply easily and feel nice and smooth, but don't really live up to the expectations advertised. However, for the price,I definitely recommend them for a day-to-day primer.