I get 350-400 shots out of a battery, but like others have said, a few spares are cheap and easliy pocketed, so it's pretty much a non-issue. I very rarely chimp, though, and turn off the camera when it's not in use. New habit compared to the 5DII (which is almost always on), and slightly annoying, but I've never been left high and dry. Most of my shooting is done while traveling so the size/weight to quality ratio is the deciding factor. Added the RX100 as the first compact camera in years I'm actually enjoying and liking the output from - the LX3 was OK, but I noticed that if it doesn't fit in a pocket, it rarely comes along for the ride. And if I'm taking a bag, I might as well take a bigger camera
In fact, I am selling off a good bit of Canon gear because it's not getting used and to fund an underwater setup for the E-M5; the 70-200/2.8 left last year, the 580EX II just got shipped, and the 100-400, 17-40 and 15/2.8 fisheye are all going as well because I rarely use them. I'll likely end up with a 5DII, 35L, 135L and an assortment of manual focus 50mm lenses and be happy. Still unsure on how often the 5DII will still get to travel with me - if I ever go to Antarctica again (tentative plan is January 2015) I may just have to upgrade for the landscape/wideangle stuff, but the E-M5 (or successor) will serve admirably for the telephoto end of things.