A very pleasant experience, traded some csgo keys for an Nvidia key very trusted indeed.
+Rep Polite and trustworthy trader. He went first even if he had more rep. He just didn't mention it. Good person.
Short version: Paid 25 sacks of gems for a global key of Starcraft 2 wings of liberty and got nothing in return.
Long version: It's somewhat complicated so I will try to be as clear and as unbiased as possible, I do believe there were honest intentions in the beginning but result is I got nothing in return for my 25 sacks of gems (~15€). We agreed on 25 sacks for a global key for wings of liberty which he would buy in g2a. I delivered the gems and he bought the key (He immediately sold all the gems before completing the trade which i think it's a bit unprofessional but that's another matter). He gave me the key and as I was redeeming it the key said it was "RU SC2 key" aka blizzard said the key was russian. I wanted global key so I told him I could not accept it. He contacted g2a and they told him it was global but I still would not accept it as I could not be sure. He then without consulting me REDEEMED the key in AN ACCOUNT OF HIS OWN ACCOUNT to prove it was global, which turned out was true. I was pissed off at that point as I wanted the key in my account, not other account. Even then I finally accepted that if he successfully changed account ownership to me I would accept the trade without making a fuss. As it turns out battle.net security is tight and its not possible to trade an account without exchanging personal information to change credentials or no guarantees that he can "steal" the account back to him any time as the credentials are his. Seeing this he deleted me as friend and I have not heard from him again. SO I have lost my 25 sacks of gems and got nothing in return.
Summary: It does seem he is a good trader in general, but if something goes wrong do not expect him to take responsibilities for his mistakes.... and expect to lose your payment if you went first, specially if it was an expensive trade...