3X ETF's

Just recently put on the market by Direxion. Thoughts? Such as BGU (3X long the Russell 1000) and BGZ (short 3X the same index) I’ve followed some of the ultra long (2X) ETF’s on the TSX and they seem to be fairly consisent with the market returns for the past 18 months, but have seen some articles outlining their shortfalls as long term holds. http://seekingalpha.com/article/104718-triple-leverage-etfs-should-be-reserved-for-the-strongest-conviction Discuss.

they are good, liquid and volatile. nice trading vehicles