Just a followup. Almost 8K miles and running strong. Most of miles are TURBO mode commuting 20-25 MPH most days. Maybe 10% is rail trails on the weekend.
Virtually no maintenance. I adjusted the belt tension 2-3 times. Flat tire and tube replacement. The battery mount came loose and I had to take it apart and back together with thread locker. And just recently I replaced the tires with some new Schwalbes (forget the model) with a better profile for gravel and apparently still as good or better street rolling for e bike.
So far no brakes or anything else. The battery seems fine. I try to maintain a 40-80% charge cycle and only run it out a few times.
Anything else I should look at? The belt seems fine with no concerning wear.