I'm not seeing a huge speed increase overall. It seems to be loading some parts of the pages I'm going to quicker, but the overall time is just slightly shorter.
There's a slight possibility that I might use this browser in conjunction with Firefox. Seeing as my whole life is in Google's products, I could see this as being my "Google services browser." I've already set my homepage to be my GMail inbox, and I might just set it to open Google Docs and Google Reader upon launch as well.
I just don't see any way that such a simplified browser, as appealing as that is, could replace Firefox for me. Even in the above scenario, I'd have to give up the extensions I use for Google's products. Like one that puts Remember the Milk in my GMail inbox, and another really great extension for Google Reader.
I'll certainly keep it on my machines, and see how much utility I get out of it over the next couple months...
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Matt