http://www.rand.org/content/dam/rand/pubs/research_reports/RR1200/RR1231/RAND_RR1231.pdf

....
Put another way, Bitcoin is anonymous in
the following sense: It is as though every bank transaction and every
bank-account balance is known to anyone with an Internet connection;
the only information that is unknown is who owns each bank
account, something that can be inferred from user interactions.
Clearly, such “anonymity” is unacceptable for everyday economic
life, and therefore additional safeguards must be built in.28 For many (if
not most) existing VCs, including Bitcoin, the current process of maintaining
anonymity amounts to learning a degree of cyber-operational
security or “tradecraft,” which seems unrealistic for the layperson.
....
"It is difficult to evaluate the ultimate security (and usability) of
Zerocash, as it has not been tested in the crucible of real-world use
and evaluation, though its theoretical mechanisms have more rigorous
security proofs than virtually all existing VCs. By contrast, Dashcoin is
currently being used and seems to be reasonably anonymous (certainly
more so than using Bitcoin without additional privacy-enhancing technology),
though it has only been in existence for about a year as of this
writing; its current market capitalization much less than that of Bitcoin,
thus an equal comparison is difficult to make.4"



...I'm bolding the part of "tradecraft" and layperson because I'd really like to see out of the box anonymity in both the IP part and the transaction part. If you give the layperson an out-of-the-box anonymity, you are tapping a much broader audience than the geek crowd who can set up their own IP anonymity/obfuscation.