Absolutely depends on the question, when you decide to enter the market and which one your choose. During the last year, i could have been a boon or a total bust, depending on timing and when you sold your stake again or if you are playing the waiting game for the handful of altcoins, which are going to become a banrburner, if all the contracts are finally signed and they become part of our everyday's life. The real best date to start investing in them is still in the future, to be honest, cause the BTC curse is still a drag on many great ideas but nor for long, i am sure.