Hi senior & junior racers!
Let me drop some lines from it's designer point of view
It uses the SAME suspension as the XX-4 (except the rear damper rod is 1.0" and not 1.2" as the XX-4) - dampers, parts, same geometrie. So it handles & drives as a XX-4 WE - and I like that
The MKI-4 has some goodies that the XX-4 has not: Roll-Center adjustable (can move all 4 blue suspension holders up & down), much better motor cooling and of course faster acceleration & higher top speed.
It's faster & more robust & takes less care time & has more setup-possibilies than the XX-4 WE. Shall we try Garry?
One very valuable setup possibility is that You can change the rear roll-center within 2 min. I often raise it by 1-2 mm and this quickens steering & gives more grip in turns. Sometimes I mount the BJ-4 front hub (as run @ the Euros 2006) -> drives as a BJ-4 Worlds.
By the way: The MKI-4 is as fast as the BJ-4 Worlds (current World Champ). In Switzerland (where I live) everyone sees that when looking at these cars. 2006 it was my driver error what let me loose the 2nd consecutive Swiss Champ title - 2005 1st, 2006 2nd place with the MKI-4.
Last but not least: I have fun & it makes fun!
Last week I run it on low grip asphalt outdoors with a similar setup (removed anti-roll bars, softer springs, a bit higher) as I used before on high grip carpet indoors - and it's cool again, it's fun & fast!
Markus