Great when an DSLR is too big.
Here are some photos from RX1:http://albums.phanfare.com/isolated/nkq0gb6m/1/5981795
Cool pictures. We have a similar place in Rochester, NY called the Museum of Play.
I took my GF3 there and it was the perfect fit. I didn't want to haul around a DSLR while chasing two kids. The GF3 comfortably fits in the pocket of a light coat, even with a zoom lens. It focuses relatively quick and the live view makes it easy to take pictures at odd angles. I saw a lot of parents walking around with DSLR and I did not regret my choice. On other trips I took the DSLR and it was all good, too, but for those types of events I really think the mirrorless cameras are great. I use my DSLR far more, but I love the GF3 when you don't want a big camera.
My co-worker just went on a two week trip. He has a Nikon DSLR and a Olympus DSLR as well as 2 MFT Olympus cameras. He took the MFTs and one of the DSLRs and said he never pulled out the DSLR. He loves his MFTs.
A stat in the recent photo mag said something to the effect of 2/3 (or something) of MFT owners have DSLRs. Not sure if those are folks using the MFTs as a second camera as myself or those migrating away. I took it as the first scenario when I read it, but in retrospect, could be either I suppose.