I think that Bitmixer is still the best there is these days, they are the biggest and already long in the game.
Another fact is that there support is also good so that is also a nice thing to know.
Bitmixer is the first ever mixing service that I have used, and it will remain the only mixing service that I am using for as long as it exists.
Mainly because of the fact that I don't trust any other service with my precious coins.
If you're looking for a professional and reliable mixing service, then definitely go for Bitmixer.
I agree they are great with their service and I must say that never saw a better one, only some websites that are almost copy and past the same service.. pretty funny to see by the way.
The bitmixer stays the best one their is honestly.