The only potential slop I know about is the back-n-forth movement in the suspension arms. I'm not experiencing it myself, but seen a guy showing it and, how to fix it on YouTube. In this forum, I have read posts where you guys talk about all the slop the XO-1 has. My question is where is it? So far, I'm not seeing it, but would like to know what to look out for incase it develops.