Yes. The list covers 0 entries that activate on this DRM platform after purchase. We show the DRM platform on every offer, so you can see it before you click.
An official store buys keys straight from the publisher. A keyshop is a store or marketplace reselling keys, usually cheaper, which is where both the saving and the risk come from. We list the two types separately and every store carries a 1 to 5 star user rating.
We only show offers the seller makes available in your region. Regional restrictions are stored per offer and filtered out before you see the list. With keyshops, check the product description on the destination store anyway, because it is not always precise.
DRM determines where a game activates and runs. The same title is often sold as a key for several different platforms, and those versions are not interchangeable: a key activated in one place will not unlock in another. So when comparing prices you have to compare versions for the same platform, otherwise the cheapest offer turns out to be an offer for something other than what you need.
As far as the game itself goes, yes: you activate it in the same application and get the same content as with a direct purchase. The difference lies in aftercare and restrictions. Refunds tend to be harder, and some keys are tied to a region and will not work on an account registered elsewhere. We only show offers available in your country, but it is still worth reading the offer description to the end. The full list of sellers we track, along with what type of store each one is, sits in our game stores overview.