I cant speak for Emmo, Fly wings none of the rest of those bikes as they are all built on this same frame but My Rz after the Mods Ive done is a joy to ride. I cant even say Im at the halfway mark because everything Im running is temporary. I used stuff I had, old battery pack, old controller and stock motor. The goal is to build a new high power high voltage battery pack with New controller and huge motor!