I bought a RR 6 plus and have owned two rad rovers prior to this.  The 6 has a big problem that made me try and return it.  It really can't go more than 20mph.  You can't reprogram it, there is no advanced menu (I tried and even spoke to Rad Power about it).

So the RR6 is 20% slower than the RR5.  There's no denying it or getting around it.  it costs more and goes slower

The best Rad Power could tell me is that maybe in the future there will be someone who develops and after market display for it that could be programmable.  So basically, I went from 24.3mph to 20.0 and paid extra for that!

I wish I had know and bought a Juiced bike instead!!!!!!