Personally I do not have any experience with Crypto Rush. Just signed up with them and going to have a look at it. For now, it looks a bit immature to me though.
On the other hand it is a start to get an idea for a first valuation of AUR. One just can't really rely to much on just this one (small) exchange. I'd rather see some of the big ones (like Cryptsy) get in on it.