We use oil with our DD. Once I let her use the oil pastels it was a slippery slope to oil sticks and then to oil paint. smile We do paint together and I think it's added a lovely bit of chaos into my otherwise-overly-controlled painting. That said, I've also learned to love acrylics since DH paints with them almost exclusively. They're definitely more of a challenge, but with practice you can make them do some wonderful things.