I personally have Firefox, IE8, Opera, Chrome (severely outdated!) and Chromium all installed side-by-side as each have their pros and cons. My main browser of choice is Firefox (NoScript is awesome!), with Chromium taking the light when I need to do anything heavy-duty related to Flash or Javascript.
To be frank, as a browser Chrome/Chromium is quite nice though it has its share of problems. It is fast, on par with Firefox and Opera, and even faster with Javascript and Flash. I dislike its RAM overhead from separating each window/tab into an independent process, however. There is also no equivalent to Firefox's NoScript, though this isn't actually Chrome/Chromium's problem and blaming the browser is misleading.
I also absolutely despise Google Updater. Why do they bundle that thing when all the browser itself (specifically, Chromium) takes is a simple overwrite of its files with a newer build to update it? Google Updater updates thing it has no relation or business with, it lingers in the background, and it creates crap in my Scheduled Tasks all without asking me. Completely and downright disgusting, I say. Google did not do Chromium justice.
But to go back to the actual query of the topic, no, I haven't made the switch. Even though my main browser of choice is Firefox, all the browsers I've come across have something that makes them stand out and worth using when the situation calls for them. Really, it's hard to pick just one out of them!
I've loved IE since its IE6 days, incidentally. :D