I've tried Chrome too - who could resist it after reading this thread
It's good and fast and takes very little time to learn and customise (not many choices).
Trouble is, I miss all my Firefox addons, such as Adblock Plus, Stylish, All-in-One Sidebar, and No Squint (resize the text with or without changing image sizes, and it remembers your font size preference per website)
In particular I miss being able to put the tab bar down the left side, which is very useful if you have a wide monitor. When it's along the top and you have several tabs open, they shrink so much you can't read them. Having it down the side it's a long list of wide readable tabs.
In Opera, that's a built-in choice I think. In Firefox you can do it by editing userchrome.css or by using one of several add-ons such as Tab Kit.
It will be interesting to see whether Google will add a few more options or just keep it this simple. At least its open source, so I guess a tweaking community will develop modifications after a while.