Definitely stay away, you can trade with general amounts for sure, but if you plan on long term storage keep it on a computer. Really, make sure to keep large amounts away from any online wallets too as most of them aren't secure either.
Ironman is right, for long term, paper wallet's are probably a good idea.
Yeah but you can accidentally extract all the funds on the paperwallet or lose it...
Just store the seed words of an electrum wallet on some paper. Most people won't realise it is a wallet. U can keep many of them without any problem.