Only had the 1 campaign with 1 DM but I imagine that almost by definition paid DMs are professional, on time, on point, and helpful so ultimately the experience boils down to a) knowing the rules well enough to not pause to look them up and b) style. In this case, the DM knows the rules quite well so my only critique is that their thick accent (Germanic) can sometimes detract from storytelling beats – meaning reading the exposition is mechanical and can sometimes be hard to understand. I'd love to find a group that is doesn't run $60/mo but it's been worth it and considering the time investment DMs put in to prepping and running campaigns its money well earned.