Seems most of the lower end ones tend to be the same. I'm sure they're OK, it's just that resale won't be there. However, one thing to note, no matter how much it costs. Make sure it's comfortable for your kid. If it's not (seat isn't set up right, things poke them in the wrong place, straps are itchy, etc), you will NEVER get your kid back in the 2nd time...
As a beginner bike, you might even consider a cruiser bike. My wife uses my SS KHS Solo One I got on ebay for $225 new. If you're not doing hard core, why pay/deal w/ gears, suspension forks, etc. Then it's maintenance free. Something to consider.
Otherewise, check your LBS for suggestions, especially if it's a novice purchase. The wrong size can screw up your experience forever.