I ran the upgrade to 0.4 yesterday after backup of 0.3.5.1
It ran fast and smooth with zero issues.
Knots RDTS now running with RBF Disabled ( I will not facilitate that evil that has been stealing plebs stack ) and OP_RETURN=0 ( Spam is everywhere else in the world, lets keep it off the blockchain )
My hat off to the devs 
a fantastic product. Perhaps you guys should consider going into the hardware wallet business as I hear there is an opening for some integrity recently…
Thank you 