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.
Actually, it is not good to have a single coin investment in crypto and it is better to spread it. Having invested with altcoins really help us to boost our gaining profit than of having bitcoin alone. The huge numbers of altcoins gives us a lot of choice and we should be very careful on it or otherwise you may just lost all your money.