I've used the G12 and it's worth every cent. Think about it like this, if you'd rather not carry around bulky slr gear like some of us and still want the awesomeness of everything canon has to offer get the g12. It's actually used by a lot of photojournalists currently out in the Middle East and i know one In Particular who's put down his 5D MK II and has stuck with his g12 while on assignment in Damascus with their civil issues going on. Why? Because its tough, light, easy to hide, takes a beating and still performs like a god, AND shoots video. The reviews have it that it's just as good for studio shoots as well with the right lighting setup.
Worth the investment. I'd say go for it, take some shots and post em up on here!