I just received my Jessica Disco Diva Set the other day, and it turns out it's already sold out online :(
I think it's fun to see the holo come out as the polish dries ^^
Comparison: Nfu Oh 61 and Jessica Disco Diva (2 coats, both over the Jessica base coat) - The Jessica is maybe a tiny bit more holo than the Nfu Oh, but I still think they are dupes. This Nfu Oh is from April 2011 and I got it at fabuloustreet.com
If you're in need of holos, do yourself a favour and buy the Layla ones that are just coming out now. There's a few up at Aveyou right now. I have 3 so far, and the other 5 are still on their way. They are incredible.