I will be using the mixer soon. For privacy reasons, once I use it, I'll let some time pass before coming back and updating the post with my thoughts on the mixer. I don't personally use Electrum, so I cannot give any feedback on it. If I get the chance, however, I will try out the Telegram bot and report back on how smooth it goes. I admit I am surprised by the responsiveness and the development speed of the devs of this project. The interaction with the community is one of the reasons why I happen to trust this more than other projects going around.
I was planning to try the mixer out this week but transaction fees right now are stupidly high. I will probably hold off until Saturday-Sunday when the fees are around 6 times lower and then report back. From what I have seen in actual practice, however, I am wondering what is the session key for? If I deposit bitcoin but lose the session key, what happens to the money?
At the least one of the advantages is that using the "chips" gets rid of transaction fees on the way out, which given the high fees currently, is quite beneficial.