It says it's for three acoustic guitars, but I use it for five electric guitars instead. It may be a little tight between the guitars for that kind of use, but if you're careful it works fine. Three acoustics may of course be a more suitable way of using it.
Quality and sturdiness seems fine, altough it feels a bit too light, would feel better if it had more weight to it. But overall it works fine. And with the guitars standing on it feels quite sturdy anyway.