Hey, nice! Games I already own (and may never play)! =P Oh, and I totally aced that test!
I've never had problems downloading from GOG. Love that downloader app. Even with my current slow-as-molasses net connection (in comparison to what I've had before) downloading games still work great with consistent speeds, even if it takes forever, so I typically download big games while sleeping.
If only I could say the same about Steam... download rates there always seem to inconsistent. From experience I can say that a roughly 7GB game will take me two hours longer to download there than it does on GOG. Must be netcode magic. ;)
Yeah, I don't know what's up with Steam my downloads there always seem to take 2-3x the time GOG does for the same file sizes.
Woo! Free games! Easiest test I've ever done. :D