I've bought a few things from them and have had no issues activating their keys.
Green Man Gaming
UPDATE: Sale is apparently over as they ran out of keys. Price is up to $53.79. Cheaper than retail, but not uber-cheap.
From GMG Rep:
It took off very quickly and we've now ran out of the reserved stock! We do still have a very competitive price though
Make sure to keep checking back on our social media too for upcoming promotions We interact a lot with customers too and often like to get an idea of the kind of deals people are looking for!
If you're about to embark on your first trip to Skyrim on PC, consider installing some of these great mods. I couldn't imagine playing without them.
Use the Nexus Mod Manager for insanely easy installation. Any mods you don't want are turned off with one click.
Tytanis Crafting Mod - Takes Smithing & Magic to the next level. Craft arrows, lockpicks, and lots more.
SkyUI - Awesome inventory sorting.
Quality World Map - Adds roads to the map for easier navigation.
Rich Merchants - What do you MEAN you don't have enough money for these dragon bones?!?!?!
Realistic Water Textures - Makes the water look amazing.
Glowing Ore Veins - Very useful. Make sure to find yourself a pickaxe first. (or craft one)
Enhanced Night Sky - Simply breathtaking. Adds galactic nebulas and crazy constellations to the already great auroras in Skyrim.
I am using all of these mods at the same time with no issues.
Edited by sublime2d, 26 January 2012 - 04:07 PM.