I do use myetherwallet, it is the wallet that I register my bounties with; I have not experienced anything bad about it, but I heard some news of some people being hacked and some wallet addresses being stolen due to made out sites people make to steal information from some cryptocurrency users. In general though, I think that it is a good wallet because it carries many different kinds of coins, plus its encryption are a safety net for users to feel that their accounts are secured.