Well I've grown just about everything Dr. Greenthumb sells. His early season Iranian strains are about the best outdoor strains I've ever seen and about the only ones that will finish here outdoors before the fall rains come and turn everything else into moudly rot. Been there, done that. Greenthumb is the only breeder I trust for outdoor gens now. I've tried other breeders so-called "early" strains and sorry, they're not usually "as advertised" and certainly none, so far has been up to the quality and yield of the Iranian line.
I've grown so-called "old school","elite" strains from other breeders and on some occasions have gotten really good genetics...no question, but I've also gotten a lot of rubbish and wasted a lot of time and money. Every, single, strain I've gotten from Dr. Greenthumb has been "as advertised", has always sprouted at or near 100% and has been top drawer quality, so I have zero problems paying a bit more for the reliability and quality the doc's seeds brings to the table. Buying cheap seeds from other breeders has proved very costly for me, so I stopped doing that for the most part.