It's a very secure website with a wide variety of payment choices, I bought AK-47 from csgo4sale and gave me the steam download code instantly with no problems after I signed up and bought the game. Other websites I've used to buy digital games also have given me codes instantly with no signup needed however
CSGO knife Skin is the only website that is fully secure and has gave me a product code, which obviously is needed if I wanted to get my money back if something went wrong, and also gave me the game download code both on the website and in my emails, there are a lot of sales on this website and will definitely use again.