I have been using Makeup Geek single Eyeshadows for about 18 months now and I can happily say that they are some of the best quality eyeshadows I have in my collection! The shimmers are amazing and the mattes are equally impressive. I also love the concept of being able to pick individual eyeshadows and create a completely custom palette. I bought them straight off their website, the only downside was that shipping was expensive. But I'm pretty sure you can get them off beauty bay now with free shipping.
At the moment my z palette is full but I would definitely repurchase my Makeup Geek shadows once they are used up!