Kristine Joy Carpio at Newsforge has used SimplyMEPIS for some time now and enjoys it immensely!
Read it yourself here.
I've been using SimplyMEPIS happily for six months. I've never had big problems with it. Sometimes applications crash, but it's very rare and it has never ruined my files. I guess SimplyMEPIS just suits my-not-so-adventurous self. I'm not really that fond of configuring stuff, but at the same time I like to do geeky stuff. For me, this OS is a perfect fit.