I have the resort Sabrina which is the same material, but with patent leather trim instead of the metallic. I don't have a problem with it falling over when it has my stuff in it. Empty it's just a pile of satin with handles on top.
I haven't had any problems with snagging or unraveling either. The material is much more durable than it looks, and I did use my bag everyday for quite awhile. The size is the same as the other small Sabrinas. It's the same size as my patent, and because the patent is stiffer than the satin it seems like it's even a little roomier.
The only problem I have with the material is that I haven't figured out how to clean it. I have a couple of little spots on the back, and I'm scared to clean them and leave water spots or something.
I saw this bag IRL when it originally came out and LOVED it, but it's definitely not for everyone. Since it's from 2008 you're going to have to be careful if you buy it on ebay, but I say if you find one in great shape, go for it!