I actually did a side by side comparison of Boba G2 and Ergo on my blog, check my profile for the link and then go to Tuesday, March 30, 2010. What it boiled down to:
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-Being peitite (5'2'' and 100lbs) the Ergo was a better fit on my frame than the Boba G2 because the Boba is a few inches wider and higher than the Ergo.Â
-The Boba G2 took many more adjustments to get a good fit for me. The Ergo was much simpler for me to adjust.
-The Boba G2 has removable head cover and foot straps...the foot straps have been useless for us
-The Boba G2 Tweet which I have is Organic and made in the USA. Ergo is made in China and you have to pay more for Organic. There was an issue with the dye they used to color the Boba fading out really bad....the Ergo has held up with washing much, much better than the Boba G2. I can't say about any other Boba G2s but last I knew they were working on fixing the dye issue so the fading wouldn't be such a problem.Â
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Other than those things, they're pretty much on equal ground and very much the same as far as how they're structured and such. Personally, I much prefer our Ergo though I do wish the Ergo had the detachable head cover.Â