I gave bitwhisk a try, and have a few words to share my experience.
The process was fairly simple, no complications at all. You enter the amount, which you'd like to mix and then send funds over to the generated address.
I liked the simplicity of the process, as well as the fact that you can enter a custom fee if you'd like to. However i wish that there was only requirement of 1 confirmation for small amounts as it makes no sense that there is need to wait for 3 if mixing for example under 0.001BTC.