I'm using Norton 360, been a Norton user for very long time now, probably more than 10 years.

When I first fresh installed Win10 I did consider of using just the Windows Defender after seeing many people said it is good enough.
But I've already bought the Norton 360 2 years package for 3 users previously, might as well give it a try.

I don't feel any slower performance to be honest, after installing and using the Norton 360.