Short handed vs full table

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Is variance higher when you're playing short-handed poker? Also, can you average a higher BB/100 when you're playing short-handed than at a full table? I've seen a lot of posters swear by 6max. What are the pros and cons on such a switch?

I'm working my way up the limits, starting at .05/.1 and I've found I like playing short-handed a lot better than at a full table. The pace is quicker, and I can get more accurate reads as well since most are playing more pots. I'd like to know because I want to know what sort of bankroll I should be looking at to play the 6max tables at the higher limits.

Thanks,
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