I brought my first (and only so far) snake from Dan at Red Earth Reptiles, an albino Darwin.
He was very helpful and easy to deal with. Especially as it was my first snake and I had a few (a lot) of questions. Haha
It was flown from Townsville to Brisbane where I picked her up with no dramas what so ever.
The snake was in perfect condition, eats like an absolute champion (it is an ABSOLOUTE guts haha) and its temperment is great, had its first shed with me the other day and it was perfect. My friend ended up buying a Darwin from the same clutch and it also eats great, sheds great and has a great temperament. Don't know if that's cause he handled them a bit to get used to being handled or it's just their personalities. He also sent two care sheets about the Darwin's a week before a got the snake to make sure everything would be perfect for when I got her home for her cage.
I actually first contacted him about the GTP hatchlings and had a chat and he politely told me that since it was my first snake he wouldn't feel comfortable selling me one as they have different needs to other snakes and told me to go research them more. And I'm glad he did that because for me it came across as its not about the 'money' and he had a genuine concern for how well his snakes would be looked after.
And he was right, Im glad I didn't get a GTP python as my first one as there is a lot to know and also not being able to handle them as much and I love handleing my little Darwin. But GTP is next on the list! They are so beautiful!!
So to answer your question yes I've dealt with them and it was a positive experience.
If you have any other questions feel free to ask.