Never heard a bad review. The guy has a forum online (which I won't link to from here out of respect), so if you do a little searching (google) you can talk to him yourself.
only ordered the once, but got my seeds very quickly, safely packaged, and because i mentioned i was a member of another forum, got 5 black rose feminised seeds for free, and 10% off.
i order from the doc a LOT and i have NEVER gotten an order sent to me in the usa that has taken longer than 9 days! i've gotten them as soon as 5 days including weekends, 10% discount to all forum members with 50 positive posts, and if you order 3 packs from ANY breeder no matter the cost you get a free pack of N. beans of your choice, order 2 of packs of the dr. chronic's beans and get 1 pack of equal or lesser value free. i've always had good service from the doc and nirvana.