I personally have bought quite few, usually the Ethereum based ones mostly do good. Had some disappointments though. Wasn't very successful with the wave based ones ...
What about you ?
I have bought altcoins, invested, and participated in the ico project. some make me a lot of profits, and there are some altcoins that do not have a pretty good selling point. this is a matter of speculation and analysis that I do. sometimes, the prediction slips from my guess. and this is part of the risk that I should be prepared for.