My Friday night group started playing 2024 rules a couple of months ago. Also made the change from Roll20 to Foundry VTT, so it's been a little bit of a learning curve for the group.
I absolutely love Weapon Mastery. It's a mechanic that is long over due. Haven't been playing long enough to say what could be done better about it, as so far it's been pretty good across the classes. I play a Rogue Soul Knife and having Vex, in order to get Sneak Attack damage every turn is really effective. Plus, as a Rogue I can use tactics more individualized for my character.
The lack of flanking giving advantage was annoying... At first. With that said, it has forced the party to actually engage in tactics that didn't just involve lining up in a row.
So far so good... Just waiting for everything to go behind multiple paywalls due to Hasbro having a bad quarter. I really tried pushing my group to go to Pathfinder after the License dust up, but was overridden. My group is more important to me than the stupidity of Hasbro, so 2024 is what we play.