I used to be a happy user of Tgx's original Black Glass - then Black Glass Nova was released and I haven't look backed since! The Nova version just adds a little something extra to the cool looking original, and I especially love the music screens, which I just find a little better compared to all other skins. With each release Tgx adds new cool details to the skin which currently pushes this skin a step closer to perfection. And most importantly... my girlfriend is able to navigate in Black Glass Nova which saves me from quite a bit frustration. A big recommendation to give Black Glass Nova a try!
It looks pretty nice and works, but if you're running 1920x1080 you're gonna see that it's not made for it. The home menu loads slow and you need another extension to be able to configure it. Overall it's quite good, but it could be better.