So its been a few weeks and few hundred miles on the bike. Further observations:
I'm 250 lbs and ride like a bat outta hell at max power. Seems range is about 30 mile (which is very good). Minute I back off and ride like a normal human I can get over 50 miles.
Brakes are silent and require a strong progressive squeeze. In other words, brakes are very linear and are not fussy or jerky. For me, a great feel.
Rear rack is solid and quiet. No rattles
Shifting remains silent and has a solid engagement. No half shifts at all.
Schwalbe super moto tires do pick up tiny stones in tread and give the impression that something is rubbing on the bike. I give the tires a quick rub to remove stones and back to normal. These tires are damn sticky with very good cornering grip. I have not been able to have the rear end slide out on me.
Minor Update: Bike running well. Only nit was a minor adjustment to derailleur (probably a good idea to do at 600 miles anyway). Have yet to use gears 4-8 but this is typical for an ebike unless you climb very steep grades.