I really don't see where you guys are having issues to understand how the mixing process works.
IMO the whole process is quite easy to understand just by reading the "How to use it" text. Care to specify where are you having difficulties?
You deposit X, you split this amount in multiple chips (addresses). You "withdraw" those addresses as private keys, import on your wallet and spend. I actually understood after reading for the first time.
Anyway, If anybody wants some help, I am always available. Just PM me.
I personally have not had any problems mixing coins on this site. I can't speak for everyone's situation and I didn't try to mix any coins for a few days before August 1 and I haven't mixed any yet since then, so I don't know if that created any issues. I can only speak from my personal experience. Hopefully support will resolve any issues that anyone is having.