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.
To OP: this is a great example of how worthy is it to invest in alt-coins. Take a look of what ironbit said (ETH).
When he sent this message, Ethereum price was $0.895, now it costs $300, you would've made x300.
Nothing more to say
