the K1 seems to be a fantastic car and is really quick.
I have built an sx3 and if the build quality of the K1 is anything like that it would be an absolute pleasure to build.
I have an XB4 and can honestly say its even better than the SX3 in terms of build. and the car itself is superb. it has everything in the box that you need and the upgrade kit that comes with the car makes it fairly bullet proof. The carbon on the shock towers isnt as thick as that on the K1 but when racing a few weeks back both myself and a K1 driver had an crash in the same part of the track, he smashed the front top diff housing and my xb4 appeared to be fine. after several more crashes in the same spot i thought my car was bomb proof, after getting home i realised the front shock tower was cracked, but thanks to the alloy plate that comes free with the kit my tower held together, and is still going strong despite several more crashes. the xb4 also has everything you need out the box.
The biggest thing though is price of parts. the XB4 is fairly pricey for parts and can be a bit more "twitchy" in terms of setup. if you over tighten the slipper you can strip the diff gears as its a geared diff with composite gears.
Both are very good cars though and as much as I'd like to say get the XB4, if nobody else is running one at your local, then go with the K1.
the help and advise from others is invaluable
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