Bob,

I have been trading SSO and SDS in an IRA for awhile. I am just switching the buy/sell signals to Matt's SPY sysyem because, well, it works much better than what I have been doing based on Matt's Tradestation backtesting.

What I do is buy 50% of the account at a time in the double ETF. That way whenever I close out a trade, I have one more bullet in the chamber.

I have a personal hard rule to never put more than 50% of any account in any ETF that holds only derrivatives, swaps, smoke and mirrors (such as SSO and SDS) as opposed to an ETF that holds the actual stock in companies that make up an index, like SPY does.

Doug Milliken