is the joint doctor legit and if not who is the best auto vendor

Just like the title says who is the best auto vendor

you'll get plenty of opinions on that. Short Stuff, Sagamantha, Big Buddah, Delicious, and Sweet seeds have never done me wrong with the exception of the Super Cali Haze from Short Stuff which is crap.

I don't know who that is. How long have they been around? Where are they located?
Bigger banks are more reputable. The worst feeling is waiting for a package that never shows up.
I'd recommend something from Sweet Seeds or Short Stuff or Low Life Auto White Russian or DNA 60 Day Wonder.
Good luck and let us know what happens.

Sweet seeds do some great autos.

Joint dr bred the original lowryder,every one else apart from big buddha and dna genetics have just used lowryder seeds and hacked it/crossed it with their stuff,Joint drs lowryder/auto strains are far more stable,hence why you pay more,I personally would say they are the best by far,as have been around for about 6 years longer than any other autoflower,and have had more work put into them due to that

Also their chronic ryder can yield upto 2.5 ozes a plant, ,and is apparently really nice smoke,

I've been growing the Joint Doctor's Diesel Ryder for 2 years now.
It's a good plant that has a decent yield for it's size, with a nice stone or high (depending on the phenotype you get).