Well I've lost interest in Geneforge 1 and 2 now...
I'm loving 3, 4 and 5 though, it must be the better interface, graphics and audio that's holding my interest.
I just finished the first island in Geneforge 3, so I've invested a fair amount of time now...
Would be handy if the game kept track of total hours played now that I'm getting up there.