Chrome just starts for me. I'm happy with it.
This is probably the best solution, as it gives you the most control over updates, and applies to all software system-wide. You're not forced to install updates at any time, and you can disable the notifications if you want.
"Some slides have failed to load and may appear blank. Click OK to try reloading the presentation, or cancel to continue viewing."
So Chrome hasn't completely ridded itself of modal popups just yet, though it's happens infrequently enough that I was pretty surprised.
One possible negative effect is that updates get installed later (an average session length later), I wonder whether that’s offset by people not installing updates when the browser starts because they have something better to do?
Calibre tells me about a new release every single time I open it, they seem to release almost daily.
Sadly the "update" button on that dialog merely opens the web-browser, where you have to manually download and install the new version. Oh, and that is a 60MB(!) download every time.
The procedure is so absurd that it's actually amusing again. That's why I'm still doing it, I guess, even though after 20 or 30 updates I still haven't noticed any visible change to the software.
I rely heavily on the information saved by Chrome every time I use a form and I noticed how it doesn't save it when I use the beta version. Now that's fine because I can just use the last non-beta release just like everybody else but on the current one (at least on Windows 7) I can't access those saved values if the form is loaded by ajax into some iframe. It's really annoying.
If only we could essentially rely on all our users' browsers being up-to-date!
I'm sure I'd be singing a different tune if it broke my browser during a silent update.