Yes they are , I've had z-atars off the same chap and they're fine. He was wanting to get rid of a few dozen and contacted me direct to see if I wanted them. Told my mate and he had 6 dozen. Got a company logo on them but couldnt give a stuff about that. My mates well pleased with them and he plays off 9.
the quality of the pro v1 is there to see,ive also used the zstar and rate those highly too,but best value for money has to be the ad333,great distance,fell,spin and they last longer than the premium balls as they dont scuff as easy