Hi,
I've been using an LX1 for a couple of years and love the way it works.
I took a look at the lx3 specs and it looks like they've wisely worked out the noise in high iso shots. This really is a great camera. You could not have this form factor with a real viewfinder or shutter. Another great thing about it is since it is all electronic, you can turn off all sound and work in silence.
And, the lens? Que? Leica I said before..... That's a lot of meatballs...
I highly recommend the camera. Like anything, you learn its strengths and weaknesses and learn how to use it for your work.
Best,
John