Everyone decides for him self, phisisical also got cons, it needs instaliation, no warranty for no errors, no warranty to work after update, higher price, wrong speed and distance readings...
Thank you guys, I just read your messages and after fast search found guy in facebook, messaged him him and after 20 min. i got 32kmh for just 75 euro. It taken me 2 hours from knowing its possible to having it on my bike