For Tom: TraderFred uses TNA a lot. Is there any reason he goes almost exclusively to SDS when bearish on the market, and not TZA?
Probably only because he hasn't created a submodel program for TZA.
Those 3 X funds (and 2 X to a lesser degree) can be tough on you if you hold them for a while because of the way they are calculated each day.
Sometimes you can't get shares to short, but I think the best way to play those ETFs is to short the opposing fund, rather than buying the one you like.
For example:
Instead of buying TNA, short TZA.
Instead of buying TZA, short TNA.
Take a look at both charts compared to the small cap indices and you'll see what I mean.
The big problem is, at least for me, I can't go short in my IRA.
Interesting side note: The time that they do work best is when they are moving in one direction, like they are now. You get eaten up when the indexes are chopping (up one day, down the next, up, down).
Source
More on leveraged ETF's from the
ETF Talk message board.