The demand for these currencies in the market is very low and it is very difficult to predict their future so no one can guarantee how valid the investment is. That is why it is better to stay away from these coins you can choose from 10 currencies at the top of the list.
If you have some extra cash then its better to invest this coin in some good deflationary coins like BOOM. It has very recently jumped 400% in one single day. Its just my opinion.