Many stories, many opinions.
Here's mine;
First let me be clear, I do not know Dr. Greenthumb, I'm not associated with him, nor have I ever grew his gear, yet.
But I've been looking at his G-13 for quite a while, and yes I'm aware like everyone else that most all breeders exaggerate the yield and potency of their genetics and yes they are quite expensive.
But I did get the chance to actually see some of his G13 personally, a buddy of mine did an indoor grow and just finished them about a month ago.
What i can say is this, it was the biggest producing indoor strain my friend has ever grown, and he's been doing this for quite sometime.
I also got a chance to smoke it and was equally impressed so I made an order myself, my reason is to cross it with some absolute primo landrace Thai of my own.
You'd have to agree there is not a seed company on this planet that has no complaints, be it slow shipments, no shipments, germination problems, you name it.
So all of them have issues at one time or another, I'll judge them on how they take care of their problems and customers.
I've had a small issue on an order from Attitude, but they corrected it right away and I will continue being a customer. But I went through a nightmare with the Single Seed Centre, I gave them ample time to resolve the issues, they basically ignored me and that's the worst thing any company can do to a customer, needless to say, I will not spend another dime with Single Seed Centre.
The verdict is still out for me on Dr. Greenthumb, maybe he is a grumpy old fart on the phone, he seems alright to me in the emails I've shared with him.
The only thing that matters to me is, if his gear is as good as he says it is and he takes care of his customers, that's all I need.
So we shall see.