I've liked all the Spiderweb games I've played, going back to the very first one, Exile Escape from the Pit. I've played demos of nearly all the games, and the demos are nearly all longer than many full games elsewhere. I've bought five of the games, though only the first of the Geneforge series, but not finished any. I'm impressed that lightnica finished the first Geneforge. I'm still only slightly more than halfway through that one, despite having the hintbook, all the maps, etc. Perhaps that's the mistake I made with all the games I bought direct from Spiderweb, buying the hintbooks and walkthroughs with the games, thus spoiling the fun of discovery in the game. So not getting them with the games when buying them on GoG may be a good thing.
According to discussions on a forum at the Spiderweb site, Geneforge 1, 2 and 5 are apparently the best, and Geneforge 3 is the worst. But that's not going to stop me playing them all, even Geneforge 3 now I've bought them all.
I hesitated about buying the Geneforge series, because they are really long games and will eat up a lot of your time. A few years ago I seriously thought of buying the whole series from Spiderweb and it was only the price which help me resist the temptation. So seeing it on sale here on GoG at a tiny fraction of that price was too much for me.