Pros and Cons of Heloc?

[Joshua Zlatkin]

So I have heard about Helocs from the webinars and podcasts presented through  Biggerpockets. I googled the benefits and negatives of using a Heloc but I'm still unsure if its worth it.   Just wondering if anyone had experience with using a Heloc for the down payment on an investment property? Are you able to get a fixed interest rate when applying for a Heloc?  Are they worth the risk if the interest rate is volatile?