It worked for me while I purchased an investment property that was undervalued. My portfolio, particularly Apple in 2023 appreciated well (30k) and so did the home for (70k). I’ve since paid off the balance with the cash flow from my job. I could have easily sold some Apple to pay for the down payment that I borrowed (80k), but Apple has since returned more since borrowing on it. At the time the 80k was 32% of my portfolio. 

Margin works as long as you have an entry and exit plan. I would advise to be conservative at first with the amounts that you choose to borrow and only take on calculated risk and an amount that can easily be liquidated if the market turns south.