I purchased my first snake through Dynasty, and have zero complaints. Questions were answered, communication was prompt, and my snake was delivered beautifully packaged and healthy. He eats great, has grown steadily, and I'm extremely happy with my choice.
The only two criticisms I have seen are ones that are really personal preference related. The first is that his younger snakes seem to be on F/T mice instead of F/T rats, so you either have to try to convert them, or just live with them eating mice. Personally, that hasn't been a big deal to me so far. The second is that Dynasty may not keep super close track of their genetics and linage, which can be a bit of a turn off for people looking to breed who want something with exact genetics. Again, this was not an issue for me, but it's something to consider if you're sold on breeding and don't want to prove anything out or have any surprises.