Yes some altcoins are. But most are not recommend to invest in. Do research on your own to find good investments.
I would recommend NEM and Ethereum.
Yes! It Happened. That was great time for trades!
Etherium is overprice in my opinion, I would not touch altcoins that is existing already for a longer period of time, the real value is during the ICO if you want to maximize your earnings in investing with Altcoins.