I'm a Mac user who couldn't care less about the virtual game table. My group meets in-person, so we have no need for it.
BUT, I really, really want the online character sheet. For me, the biggest barrier/time sink as a player is the time I spend updating my character sheet, especially if I want to use a supplement. In my current campaign, I'm playing a strictly OGL character so that I can simply use PCGen as-is.
I really wish WotC created the character generator in the SaaS (Software as a Service) model. All the database could be on a server in the cloud, and anyone with a web browser could simply log-into their account, make changes, then print out a new character sheet. As I buy supplements, I enter the code printed in the book and I get access to the new rules instantly in my sheet. Again, there's no reason why there needs to be any client app for this, all I want is to be able to fill out an online form and have all the calculations and the layout of the character sheet updated so that I can print it out. For this functionality I would be more than willing to pay $5 per month. Throw-in digital Dragon and Dungeon magazines, and that becomes $10 per month.
There are so many advantages to this I'm flabbergasted WotC isn't doing it this way.
Windows, Mac, Linux would all work.
Sigh…