Is the 200-mile range realistic?

Treat it as a best case. Range claims like this usually assume low assist, flat ground and a light rider. At 42 mph, in cold weather or on hills, expect a small fraction of that.

Can I ride it without the motor?

Barely. At around 160 lbs with 4-inch tires, pedaling unassisted is hard work. Plan on using the throttle or assist most of the time.

How does it compare with a moped or a lighter e-bike?

It sits between the two: moped-style seat, suspension and speed, but still an e-bike. Lighter e-bikes are easier to carry and pedal; a moped needs registration and a license in most states.

What size rider fits it?

Ehora lists riders from 5'6" to 6'4". Shorter riders may struggle to reach the ground on the wide seat, and the 330 lb limit covers heavier riders.

Is it legal on public roads?

Check your local rules. A 42 mph e-bike exceeds the 28 mph limit for Class 3 e-bikes in most US states, so it may count as a moped or motorcycle and need a license, registration or insurance.

Can it handle rain and mud?

The IPX6 rating covers heavy spray and rain, but it is not a rating for submersion. Wash it with a hose rather than a pressure washer, and dry the chain and steel frame.