Brendan,
I have a 2016 Kappa 400 x-motion and I love it.? I purchased it from a shop and am the second owner.? I did need to add the digital crosscut to the saw and a few accessories as the previous owner only used it to rip sheet goods and purchased it without some things I would want.
I got it before the crazy change in used machine pricing at the beginning of the pandemic, so I got a great deal.
I would have paid full price for a new one now that I understand the difference.? It has all the power and finesse that you would ever want and once it is aligned, it holds a setup!? I get perfection in setup without having to hassle over it.
I have heard that the basic chassis is the same (900 and kappa) but I have not validated that.? My kappa came with an analog crosscut fence (as I said) but with the larger size extrusion that works with the Felder digital stops.? The 900 saws come with a smaller extrusion when you get the analog crosscut setup.? Having the control panel above you to change everything is really nice. You can program all of your blades into it and set different kerf measurements that adjust all the other parameters as you change blades.? I have auto park for the scoring blade, which makes life easy when you choose to do scoring.
You will not be disappointed!
PK