I had a multi-colored set of d6s that were specifically used for rolling character stats. They rolled great. One day I was making some Rifts NPCs for my husband and kept rolling over 20 (if you roll a 6 you keep rolling until you stop rolling 6). He banned me from rolling them again because I made some characters with almost superhuman stats. So they were retired.
My new favorite dice are from the company DoubleSix. They are twelve-sided dice that come in double six, triple four and fate dice. The first two are my favorites. They roll much better than d6s.