my friend has the competiton ver. and he says it's really nice. but not totaly accurate
the pro sucks imo, it's much less user friendly.
but i were you then i'ld get the Apex-i rev/speed meter with G-sensor
it's mch more accurate, easier to use, and has mor functions Apex-i rev speed meter
but one thing i was wandering is, does anyone know where to get it with mph instead of km/h
it says "apex-i rev/speed meter gp (km/h)
but it also says you can do quarter mile times, 0-60mph and 0-100mph, so i'm not real sure on this. but i won't be using mine for my speedo anyway. just times and hp