I've had the triplet Mark 2 from Sharpstar for a while and think the CA is moderate and way better than the Nikon 180mm that this scope has replaced for wide field. So far what fringing I have seen varies depending on what filter I use.
1. Many of the issues can be dealt with by using the defringe tool in Lightroom.
2. When doing detailed processing with multi narrowband filters I often get purple fringing even on my more high end scope and also on the Sharpstar. I make the halo removal in Pixinsight as a matter of routine, using the script by Shawn at visible dark.ca. It jukes nukes the purple halos.
3. Sticking in a filter with a stronger cut might help. I got one of those for my Nikon but haven't really needed it with the Sharpstar. Fringe-killer is what they are called.
I am not saying the CA is a non issue or absent but I think there are easy workarounds.
By the way, I am testing a new way of using this scope with a 1.0x flattener. I'm not there yet with the backfocus details and have some tilt, but will share this here. I'm using the Altair Variable 1.0x flattener, and have done some test images with both a Nikon Z6 and Hypercam 269c. My processing includes wiping out the fringes. Here is an example. It's based on a very rough guess for the backfocus so I think I can do better with some tweaks to the spacing on my rig. This is a 4/3 sensor. Full frame images with the Nikon have some distortion in the corners but are fine unless you pixel peep. Astrometry.net came back with a focal length of 340mm, so it's a handy alternative to the FL you get with the standard reducer.
To be honest, I think the CA is a moderate and manageable issue. You get amazing full frame illumination with this scope and with the 0.8 reducer star shapes are great to maybe halfway between APS-C and full frame.