I bought this bundle simply because I love the concept too. I already own two of the games and probably won't play more than one of the others. But the idea, execution and team behind it are simply amazing. The charities they're donating to are also a few of the only charities I've ever actually thought of as interesting.

I have upgraded to version 5 and so far I have seen no real difference. I am not a very avid user of plugins so the incompatibility was not a concern for me. I can honestly say that I have no clue what they changed.