I have the Chameleon and have had the 1st Solaris Max, and now also have a Pace RC627.
I ran the Chameleon 27.5plus and 29
I am running the Pace semi plus 27.5 with 2.6s
The Pace climbs and decends better than the Chameleon which I didn’t expect. I am on a XL frame and the geo is almost identical between the Pace and the SC. The pace is slacker at the head and steeper at the seat.
The chameleon is awesome, especially the short chainstays, but I think you want to run 140mm to get the best from it. This, unfortunately makes the seat angle a bit slack for climbing though. Also the headtubes are short ish with an internal headset so its hard to get the bars high enough if you are tall.
Finally, my 2019 frame has a maximum seatpost insertion depth of 215mm so I couldn’t use a fox transfer 150mm dropper. This can be overcome by using a oneup dropper instead though.
I had brilliant service from Pace when I bought my RC 627frame if that helps. On balance I also had brilliant backup from Santa Cruz Uk.