I have not invested altcoin, yet. But it seems profitable, and fast rising. And I think it is an opportunity for people who said "Am I late for bitcoin". And I haven't got money for big investments or little risk low income investments. But people who has a lot of money and will make big investments should be very careful.
I also think that altcoin will make a profit faster than investing in Bitcoin. Because there are so many tokens when just listed on the exchange of price will be very low. We can buy and hold for a few years