"They" are not "good to go" unless you personally know his source or are him.
There are plenty of research chem places that send out plenty of shitty products and it doesn't come out for a long time. Yes, there are reputable RCs, but it seems like you just never know when they are going to start putting out crap, or you will get the odd useless arimidex or nolvadex and end up with gyno because that's all you have and you cannot get a good replacement product for 3 weeks.
OP, you need to very carefully research the company if you plan on purchasing from a typical RC. In my experience here, I can even think of one that many members of this board refused to say a bad word about while they were putting out bottle after bottle of useless, crashed, ineffective, or just outright fake crap.