Is the 90-mile range realistic?

No. 90 miles is the manufacturer's best-case figure. Expect much less at 28 MPH, on hills or in cold weather, and plan on roughly a third to a half of that in hard use.

JASION claims up to 28 MPH. That is above the 20 MPH limit for Class 2 e-bikes in many places, so check your local rules before riding on paths.

JASION does not list a weight here, but a steel frame, full suspension and 26 x 4 inch tires put it in the heavy category. Plan for two people or a ramp to load it.

What comes in the box?

The bike, a rear rack and fenders. The battery is removable and the bike has an LCD display, lights, horn and a USB charging port.

Can I ride it in sand or snow?

The 26 x 4 inch fat tires are built for sand, snow, gravel and grass. Traction is good, but range drops sharply in soft ground.

Is it worth it over a lighter commuter e-bike?

If you ride rough ground and want suspension, fat tires and a big battery, yes. If you mostly ride pavement and carry the bike upstairs, a lighter Class 2 commuter will suit you better.