...
IMO,
bitmixer.io has been trustworthy. I have mixed
BTC about eight times over the past two months or so. I have had about the same success with
sharedcoin.com.
bitmixer.INFO is the one getting bad reviews, I have not tried them.
Of course, "YMMV". But, I have been happy w/ bitmixer.io.
***
Perhaps someone here could run a "whois" or similar on bitmixer.io? (I do not know how.)