Does anyone use Fortiguard DNS servers?

Does anyone use the default Fortiguard DNS of 96.45.45.45 and .46. Ive had issues recently where my 200f was unable to contact them causing my Fortiguard services to go down and affect our web filtering service among other things.

I've seen people complain about these DNS servers in the past and I'm beginning to see why.

What do people like to use instead of the default?