To jump right into it, the polish is not the greatest quality. It can be quite watery and you can tell you get what you pay for. The brush, however, I really liked for nail art. I am not sure it would be so great for fancy designs, but for stripes it works really well. The long brush can almost lay across your nail for a straight line and this makes it a lot easier to use.
Would I buy again: probably not. It is a good place to trial nail art, but personally I will be trying other brands.
My sister has one of these. It's really difficult to use but I believe that it may just take time to get used to. I will continue to try it but I don't think it's worth having more than one until you know how to use it.