It's a little low on the G series totem pole. There were three G series, the G-X000, G-X500 and G-X700. Actually, I think it's the smallest of the G-X500 series. The best build quality is the G-X000.
If you can get it cheap enough and don't have to put any money in it, it's probably going to be an ok starter. If you are looking for something with a bit of umph, save your money and wait for something better.