I tested the splash.tf exchange yesterday. First impressions are quite satisfactory. Shortly after the second confirmation, I got coins in my wallet. Fast and easy, and most importantly, competitive rates.
As a suggestion, I would add a 'copy' button for both the deposit address and the Letter of Guarantee. It would make copying easier, especially for users with a touchscreen.
Also, when an invalid address is entered, there is a red warning in the lower left corner. It may not be the most noticeable, so it can confuse the user. However, I would put such a message somewhere more direct, next to the field for entering the address, for example.
I was also going to suggest removing the background with the animated lines, it's quite annoying. But I think you've already done that.