We bought the boys' 16" Next Wipe Out bike from Wal-Mart as my son's first bike. Yes, the name for the bike is a terrible one. The recommended age range for the bike is 4-6 years and at the time he was 5. It came already assembled and had training wheels and a water bottle on it.
The bike was always a little hard for him to get moving when he began peddling. I don't know if the problem was with him or the bike. The bike had both a brake on the handle bars as well as the traditional brake of reversing the pedals. He never was able to operate the hand brake on it and in my opinion for this age range, I think the hand brake was more trouble than good. We also had a problem with the training wheels getting loose often. I had several different men that I know tighten them and it happened each time. On a more positive note, the bike has spent almost every hour we have had it outside exposed to the elements. It has been close to 2 years now and it shows just a little rust and there is no cracking on any of the plastic parts or pads.
For the money, this was an O.K. bike. He did not ride it as often as I would have liked but I think that was just because it was not his thing rather than a problem with the bike itself