Free-bees.co.uk have tested the latest SimplyMEPIS, but it seems like they prefer Ubuntu.
The review starts here
If you do not care about proprietary applications, but want something easy and simple to use, then I recommend Ubuntu. If you do care about proprietary components, then Ubuntu is still worth considering, but so is SimplyMEPIS 6.0. Personally, I would go for Ubuntu, since you would be left with a more solid distribution in the long run, but MEPIS is by no means a bad choice.