I've got the 2300 battery/case and random people ask me if my iphone was worth the money, lol.
So, no....I don't get made fun of for it, except for people calling me a tool for buying Apple products, lol.
Also, random people are stupid.
I actually like the feel of the phone better with the large battery. I've accidentally dropped the stock G1 a few times because it was clumsy to hold, haven't had that problem with the extended case.
Phone: Galaxy Nexus