If the Gen 2 Replay is anything like the first gen, I doubt you see near the hacks for it that Tivo has.

I own a DTivo and a 1st gen Replay and personally, I prefer the Tivo. Funny thing is that this isn't my first Tivo. I bought one when they originally came out and kept it 2 days and took it back. I guess the dual tuners is what sold me. I had my 1st gen Replay for over a year before I bought the DTivo and I really didn't think I was going to like it when I got it. I had bought my dad one for Xmas and played with it some and decided the dual tuners would be worth slumming down to a Tivo again.

I almost bought a Replay 4000. They have hacks for that unit which allow you to offload video over your network and there is a single drive hack for it as well. The two drive hack MAY be done, I haven't really been keeping up. If the 4000 is anything like the 1st gen, I doubt we see any OS hacks anytime soon.