Ranked in these QuestionsQuestion Ranking
Pro Typically significantly less expensive than competing services
As G2A is a user marketplace, keys may be purchased during sales and resold for significantly less than current market value. Because of this, keys tend to be very inexpensive in comparison to Steam, Origin, and Uplay.
Con Risk of stolen keys
As G2A is a user-driven market place, not all keys sold may be legitimate. Anyone from anywhere can list a key for sale à la eBay and Amazon. However, like eBay and Amazon, G2A provides the seller's feedback rating and number of sales prior to purchase.
Con Opt-out service on checkout that is easy to miss, which charges and subscribes the purchaser to something they may not need or want
Many people have reported issue with the "Shield" subscription service, that seems to auto subscribe users when purchasing keys. It has also been reported that is is pretty difficult to get this subscription turned off, which can be frustrating for those that never wanted it in the first place.