Intkeys gets some flack from some people because of slow delivery times and needing to use a VPN to activate some games. While these are valid concerns, and I have had to deal with both, Intkeys made sure that I was taken care of for every order I have made.
They offer competitive prices for the products they offer and do deliver, even if it takes a bit of waiting to receive your purchase. If they are being to slow (their official policy is a delay of 24 hours) they will offer a 10% discount. That's not bad in my book.
I trust Intkeys enough that I've shared them with a few friends, even recently enough to have one of those friends to purchase a Civ V DLC key for $6 - when it normally retails for $30!
tl;dr - Cheap prices, fair delivery speed, occasional annoying VPN issues
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