Margin thoughts. I've used it for over 15 years but with great caution. Usually I only employ it when net new lows are minus 5% or better; for reasons which can be diligenced from my prior posts.
That being said, if you buy profunds enhanced funds, you already 'are' margined but without losing sleep worrying about a margin call.
Also, anytime I was heavily extended, I dumped some margin whenever the tide seemed against me, years ago.
For people inclined to chase high fliers at market tops, it can be a fatal tool.
If employed with caution at major mkt lows, whose signs can be diligenced back for many years, and only on solid investments, example sp400, I think its a good tool.
But nothing appeals to me more than Noconas hourly system, you don't hang around long, if wrong you are out quick. I charted his results posted month by month since May 24 and I see a relentless forward movement, including and despite being stopped out a couple times.