Not good to see two dead batteries coming in this shipment already! Mine got here today and I am just in love with it. I started with a Z10 and then had an S18.
I saw a comment about the wheel wanting to go all over the place earlier...I think it comes down to rider experience. You keep a loose stance, but stay firm over those pedals and keep a flat line, you are golden. I like that it wants to go all over the place, good for carving and pivoting. The S18, and even the Nikola as well both like to go in a straight line.