Re: trying to select a bike
Coaster brake is OK as long as it is NOT YOUR ONLY BRAKE.
You need to install front wheel brake too if your bike does not have one.
Cheap coaster bikes from Wally don't have front wheel brake.
There is a big difference having one brake only when you need to stop quickly going 30 MPH or more versus unassisted bike doing at 10-15 MPH max when pedaling.