Yeah ! , and the GG version is DRM free too , imagine I bought the equivalent at of the GG "Dungeons & Dragons Anthology The Master Collection" at GOG.com at a sale with a handsome discount and still the GG offer here is like even half the price compared to what I had to pay GOG for the same games at their bundle sale.....!!!!
Why do the screenshots of Icewind Dale seem like they are taken from GOG(Char names are all GOG_)? Also do you need to download a client for gamersgate or is it just browser downloading?
Each GG game (or eventually as "game pack") has its own downloader. What you download is a file that is named after the game and that will download and install the game. GG does not deliver save forever ready to run /install game files like GOG , if you want to reinstall you will have to restart the downloader for the game even though that you may not have deleted (or moved) the downloaded install files..... (so GOG versions are far superior with respect to that!!!)
So reinstall requires an internet connection.
Also some games GamersGate sells like e.g. "A game of thrones: Genesis" is actually a Steam Game so you need Steam for that as it says on the game page : http://www.gamersgate.com/DD-GOTG/a-game-of-thrones-genesis
(With respect to Steam games from GG then you might be able to "redeem" the serial or whatever in the Steam interface and let the Steam client do the installing and downloading)