I jumped ship to PC around the launch of ch4 (but before Ch3 on wiiware), and never looked back. I even hooked up my laptop to my HDTV, with my wireless keyboard/mouse so i wasn't missing anything. You'd be surprised how well a mouse works on a sofa. The best thing is that i got all the PC versions, plus the Season DVD (when thats out that is) plus the first two wiiware episodes for the price of all five wiiware episodes.
I would reccommend you stay with PC for all future non-simultaneous TTG releases. The atmosphere on launch day/evening is stupendous, i just regret i was only there for the last two chapters.
"The universe has to move forward. Pain and loss, they define us as much as happiness or love. Whether it's a world, or a relationship...everything has its time. And everything ends."-Elizabeth Sladen: RIP.