I'll say the same thing about the Xbox One that I've said for the PS4...
1TB should have been the default/launch size for the hard drive. They should be showing off a 2TB or better version now. I mean 500GB is extremely low when games take up 20GB on low end or over 60GB on high end for a single game. (I mean supposing you had a full 400GB to use and games averaged 40GB... that's only 10 games. Most gamers have more than that easily.)