I see people talk about the announcers from the old days, I would add Earnie Saxton to that group.
Since I don't subscribe to Flow currently. Barry Angst did a great job at Bridgeport last season, he currently is the announcer at Big Diamond. Wall announcers deserve a spot in there also. Earl and Gary do a great job.
Nick is alright and does a decent job but he gets too loud at times. Since NES has done the Facebook live segments there's a disconnect there. This past Season they did not realize one of the leaders dropped out a few laps earlier! Multiple times of absolute silence during restarts. When Jim Murdoch is at NES helping out, the product is a lot better.