I had some Ryobi and was/am disappointed with them.
MonteCristo is correct with the one size does not fit ; brad point, Forstners, and twist drills are all useful in woodworking. I use my brad point bits the most since they are much easier to locate on the center mark than a twist drill.
My brad point bits are Irwin (very old set) and the sizes are marked as inch but they do not really measure out to inch dimensions and I assume they might be closest metric equivalent.
I have a set of Forstner bits I bought a Costco and I am very happy with them!
Mike is correct about a sharp bit, you will burn wood, possibly damage you project, and open yourself up to possible injury using a dull bit!
-- "I never met a board I didn't like!"
