I think the 'fly by night' breeders offering S1's get lots of crap because the strains are generally released without being tested. All the solid breeders offering S1's usually test them out first.
Or we do donations to local patients & growers for even more testing than what we do ourselves
The problem with S1s is if I take
GG4 #1 (pollen donor)
GG4#2,3,4 (pollen Receivers)
Other strains (Receivers)
If for instance I run the seeds I get from the donor plant 9 times outta 10 any herm traits would be more likely to show in those offspring opposed to the receiving gg4 clones which would be less likely to show the same traits as the seeds procured from the pollen donor
Just speaking from personal experience as I've been breeding both regular and feminized seeds for years & the seeds that came from the selfed plants were the only ones I've had show intersex traits in the next generation from ALL Of my Crosses
Personally I like using Feminized Seeds , None of my Shit Herms
99.99% of the time
But Cannabis has been throwing nanners for 5000 years , it's in its nature