some words to explain 28 page in a spanish forum and 6 in a Dutch forum :

I'm member of the Spanish forum in which there have been a lot of problems with Steve. I'm not one of his victims, but I think it's fair that you know what the people are saying about him. If you don't mind, I'll abbreviate a lot, as it would be really difficult to explain everything without summarizing.

He sold boas that had obvious IBD symptoms and it seems that he also sold boas with cryptosporidium
After the bank transfer of some of his customers, he sent them some terrariums that were different from the ones the customer had paid for. Even more, they had been previously used and one of them was incomplete. This shows his lack of professionalism.
He has been selling animals whose papers were not in order, and so they are illegal or at least not totally legal in Spain and their owners can't register them.
He earned much money with his "business" (buying snakes abroad and selling them in Spain), while he was telling the people that he didn't earn any, that he was doing them a favour. Of course, those people were really grateful for it!
He also tells that nearly all the animals he sells come from his facilities, and some people discovered that they came from other breeders in Europe, breeders from whom Steve buy animals for less than half the price he sell them.
He created a company with the wife of a member of this forum and he stole the benefits.
He spoke badly of anyone who could reduce his benefits. For example, he told that the hogg island boas of a member of the forum didn't seem to be pure and took the opportunity to sell his boas, which cost much more money and looked exactly the same as the ones of the other member.
And he doesn't answer nearly any of the telephone calls, e-mail or complains from the people that have been cheated over the last two years. In the few cases that he admitted his responsibility, he promised to change the sick animal for another one if the victim didn't say anything in public.