Their frames can crack. There bikes are not all that for a full size adult. I don't like there brakes. The stock rear wheels will go through spokes. If the coaster brake hubs are not pampered they lock up.
While some guy's only weigh about 130 pounds wet. Have a good read and read every one of these and make up your mind?
frame cracked - Google Search
If you just want to cruise around and put to me that's peachy. I don't ride that way all the time.
I can come up with a bicycle meant for a Morini that ways in at a total of about 70 80 pounds.