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I am a relatively new BTC guy interested in the mixing services as well. I have used both
bitmixer.io and
sharedcoin.com both about eight times each. In most cases, I ran some BTC through BOTH services to help better erase taint. I believe (but not being an expert, do not KNOW) that using BOTH services did indeed cover up the trail "good enough" for at least casual trackers (both used an intermediary wallet, so the Blockchain did NOT ID either the sending nor receiving wallet best I could tell).
I too would be interested in learning more about either bitmixer and/or sharedcoin.
Also, a few days ago, someone new here noted their new service:
bitimix.com. Any comments on them (or any other respected mixing service) would be much appreciated too!