Had my Bolt 2 for just over a week now and ridden:
Indoor (spin bike with PM)
Road
MTB
MTB with GPS route planned
Have to say that it's much easier to read the screen with the subtle colours in the new device, everything is just that bit clearer with is ideal for short sighted glasses wearers like myself.
I also like the highlighting feature of the parameters with colour coding and especially the colour coding in the lane when using a Garmin Varia, that feature really makes it easier to see what's going on.
Only used the GPS once so far on a 50km MTB ride and it was easier to follow thanks to those colours once again. Not used the other new GPS features so far.
I can report though that mine does seem to have a bug: