I switched to chemical dye too, mainly to get my color even to not have to dye at all, because I'm an extremely lazy person and don't like to have to redo anything.

For the record, I used Sally's Ion Brilliance liquid color w/10 vol developer. I did my mom's hair (lots of grey) and used 20 volume developer. Her hair was actually softer when she was done! I'm very happy with the product and will definitely use it again if I ever need to.