I have both the 800(20 months old) and 850(6/7 months old) and both are great, very useful to have the usb lead to tune the turbo settings and switch full brakes on and i do believe there is a handheld tuning box now.
I have had my 800 for nearly 2 years and has taken a hit from a motor going boom. and i have also seen a 800 (not mine) surviving a reverse connection and melting the solder corally and the speedo work fine afterwards.
So i would guess that the 850 is just as strong.
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