Ben, One of the owner's is a cool dude. I've talked with him a few times and he is more than happy to answer questions for you.
I tried P.O's chem 4. It was a great yielder, 1.8lb a light with a 2 week veg. It wasn't a chem4 to me though. It was more of a bubba cross. I ended up calling it sweet bubba, I liked how it yielded hard as fuck but i'm not running it anymore, its not that boutique strain. Also , I had PM issues with their clones, they disinfect their clones as a preventative measure before you leave with them, but about 3-4 days after I put them in my vegg tent, PM came about on one of my OG cuts and spread.
Overall, I like P.O. their chill and respectful, Chem 4 was the only strain I got to run from them but this club is one of the best in LA. I will say this though, I will never buy clones in LA ever again !! Nor Cal only, Its worth the 8 hour drive ! For reals !!