I've been enjoying this lately. Finished my first campaign as Cyclops, going through again as Domino. Really solid expansion, although I do not like the new Side Missions mechanic they added to the Marvel Champions formula... but luckily, you can mostly ignore them.
Also started a campaign with a friend for the previous expansion, Next Evolution. That expansion has also been really good so far.
It's a good time to be an X-Men fan... I'm also rewatching the 90s X-Men show (again) so I can start watching the new X-Men 97 series.