Why not Opera? The new Opera is Chromium with what I think is a better design[1] that respects your OS[2]. You don't have to sign in to sync, but you can if you want. It's not open, but they're not an ad company. And finally, it's said to be faster than Chrome.
[1] I prefer Firefox so I use the FxOpera theme
[2] Well, it tries its best on Linux (unlike Chrome), but it's near perfect on Windows and Mac OS
Personally I don't use Opera because it doesn't let you customize mouse gestures. They consider it too geeky a feature :) http://i.imgur.com/fDSjYZq.png
Yes, because it manipulates the system in some way beyond copying the app to app, it's often hard to deinstall without traces, hard to keep two versions side by side etc.
So if the pain of the installer is larger than the added benefit of using Opera vs. Chrome, then yes.
[1] I prefer Firefox so I use the FxOpera theme
[2] Well, it tries its best on Linux (unlike Chrome), but it's near perfect on Windows and Mac OS