Left is the $180. Right is the is $130. Bearings vs bushings. The timing system is similar to MyLaps, but uses a different transponder. Most use an external battery to power the transponder. There is a way to solder the transponder in, but I like being able to move it to different vehicles. For my home track use a LapTracker app on my phone and the Zeppin lap timer. Two in the group have the MiniZ buggy. Drives really nice in my limited chance to use it.