If you’ve seen them recently, I think it is the songs from Lizard that have improved most dramatically when played live. This band is much more competent technically than that band was. I also think there’s a bit of an added bonus in that Lizard was not as overplayed by most Crimson fans (well, other than by you strange Lizard fans) so it seemed more like new material. Circus in particular just comes off really well.
Saw them about two years ago, performing sets of their old material. A potent mix of old & new musicians - finely tuned.