I have used lots of them, probably more than anyone else. Three issues you will have.
The tires are junk and will wear out very fast, many of the kids tell me they had to replace them daily when they rode a lot. 6-8 hours of riding on asphalt is about it.
The center hub will break. We were welding them before they were ever used, that did help a little, but they still tore out the center.
The bearings will fail. We generally would replace them before the wheels were put on the bike. They did not last as long as the tires did.
BUT, they are cheap.