I sold my Xray to buy a K1 Aero... find it quite amusing that everyone talks about the X-ray being bullet proof... Personally I broke two front bulkheads really quickly on mine but haven't broken anything on the K1!!!
Depending what surface I am on, normally I stick with the gear diffs, the ball diffs are a nice option to have and not stupidly expensive either, mine have lasted well and I can use them in my KF if needed.. I don't think all the team use balls? When I spoke to Tom last he was on gear diffs and his last couple of setup sheets reflect this??
Mine had no upgrades at all, I have added bits more because I like a bit of bling than anything else... and there is no shortage of that if you want it, but not really necessary from my experiences..
Ultimately they are both great cars, I don't regret selling my X-ray at all and am more than happy with the K1, so would recommend it to you..
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