The HTML5 player has been standard for at least a year now for GS. The two primary reasons I've avoided it are:
- Lack of broadcasts. (Presumably available in their native app.)
- Lack of wired.com-esque topnav position fixing in Chrome mobile. It's a minor thing, but having the entire page shift down every time you scroll can lead to incorrect menu selections when mindlessly selecting music.
Still, not cool. It is not uncommon for someone to use my machine for a brief stint. Say we're about to go somewhere and I ask them to print the directions. I'd rather not have emails from 5 years ago pop up in an innocuous search.