I will say, it's awfully convenient to not having to back stitch or tie ends. Hopefully it doesn't untie with washing and use.

I have it on my machines, and don't use it. I've seen it come undone, I'd rather tie off manually.

I use it for the beginning & end of long seams like for borders but not for quilting. I don't like the bump it leaves.

I have that feature and use it often. I've not noticed a problem with it pulling.

Always use it.