I already have a few 3x3 speed cubes but I want to expand the collection to other n-order cubes. I was looking at the Mofang Jiaoshi cubing classroom and I saw on the review that either the stickerless or the black version has an MF3 instead of the newer MF3RS. The problem is I don't know which one has the MF3RS (which is the one I want) and I don't want to buy the wrong one. It's not very easy to get information on cubing and twisty puzzle products in my country (South Africa). Please help a brother out. Please also reccomend a cheap cube that's suitable for competitions.