The leveraged short and long ETFs have built-in decay which makes them unsuitable for anything but daytrading.
http://seekingalpha.com/article/119316-double-and-triple-etf...
http://seekingalpha.com/article/119316-double-and-triple-etf...
The only difference with the leveraged instruments is the corresponding loss is greater. But that's the whole point of using leverage -- the gain is greater, too.