I've had 8 very successful trades with Why So Serious, and he is very trustworthy.
Bought 200 AC130 kills, very quick, higly recommended
Bought map pack 1 on CoD4 off him, gave me account details straight away, recommended
Bought map pack 1 on WaW off him, gave me the account details straight away, recommended
Bought map pack 2 on WaW off him, gave me the account details straight away, recommended
Bought map pack 3 on WaW off him, gave me the account details straight away, recommended
Bought Pain (DLC game) off him, gave me the account details straight away, recommended
Bought 500 headshots off him, gave them very quickly and he wasn't fussing about, did them all in one go, recommended
Sold him the prestige hack (did it for him) paid me 250 headshots immediately, very very recommended
I have done a lot of trades with him, he is one of the most trustworthy people on NGU, in my eyes.