Project Eternity is now going to have a DRM free option for those on the fence.
"DRM Free Option You asked and we are delivering. In conjunction with GOG, we are going to offer a DRM free version of the game for our Kickstarter Backers. When the campaign ends, you will be able to choose whether you would like a key from GOG or Steam. For our Mac friends, we are still working on a DRM free option, since GOG does not currently support the Mac."