Never ran any S1s but Nspecta's gear has always piqued my interest. I've kind of avoided them because I remember him saying that about 50% have recessive traits in his Potcast interview.
I pulled up the episode and they start talking about it at 21:35...
He says that there's some strong, good quality plants but he almost looks like a pure S1 as almost a throwaway and that feminzed hybrids work better as an outcross.
I've seen awesome pics of his S1s and heard great stuff as well so do you just need to run through more seeds to find a good keeper?