Meh.<p>If you're using GA to prove your site's worth, e.g. in some M&A deal, this is useless - your proxying means that you can fudge numbers and thus is no better than anything else you say. (This is a significant use case among looking-for-exit startups).<p>If you're using GA to get insight about your website, it would be somewhat useful, but not really - because GA would not be able to correlate the cookies to figure out the demographics, etc (and I don't know how much it would trust Via / Proxy-for headers, so other statistics it gives you are also limited).<p>Also, if you have non trivial traction, you're going to get flagged by their fraud filters.<p>You're probably better off running a local Piwik or whatever it's called these days.