I have owned one of these for a couple of years, and bought two more six months ago. All of them are still working, while all of my original Apple G4 supplies are defunct. On most of the Apple supplies the charging cable or connector eventually broke, but that has not been a problem with these.
The weak point of any G4 supply is the connector that plugs into the Mac, and there is only so much that can be done to improve it. Like most aftermarket supplies, this one does not have the amber/green charging light, but it does have a sturdy cable with a molded-on plug. On the whole, this is a good tradeoff.
The only improvement I would like to see would be a two color charging indication built into the body of the supply.