Just the c99 myself, my cousin is growing the grapefruit 4, its got a sickeningly sweet smell to it...i was more fortunate with my c99s than you, got a pretty perfect match on 1, but total garbage the other 3....the g4's from what I seen look very nice, his began getting very frosty at the beg on week 4...and they gonna be massive yielders, big old fat bats
I have grown out quite a bit of Female Seeds gear. They are generally reliable and G2g as far as germination and being female. You still have to pop enough beans to pheno hunt and get a keeper. I have grown C99, Ice, Easy Sativa, Skunk Special, and Moroc x Grapefruit (x line). I wish I still had the moroc x grapefruit....
As far as fem seeds goes, they are probably some of the best IMO, and reasonably priced as well.
As said above if you have the space to pheno hunt and grow out a few packs you'll find a keeper 80% of breeders are like this my go to are mr nice G13 labs dinafem humboldt seeds org emerald triangle serious seeds cbd crew for medicinal and rare dankness