Not all smooth sailing for the PATENT Act?

TheHill suggests that there are some concerns with the PATENT Act proposal for patent reform:

Sen. David Vitter (R-La.), ahead of the hearing, announced he was signing onto a pared back patent proposal sponsored by Judiciary members Sen. Chris Coons (D-Del.) and Senate Minority Whip Dick Durbin (D-Ill.). Sen. Mazie Hirono (D-Hawaii), who is not a member of the committee, is also a sponsor.
Coons said the bill from the Judiciary Committee leaders is "less bad" than the House's version, but said he still would not support it.

[http://thehill.com/policy/technology/241332-doubts-about-patent-bill-surface-at-senate-hearing]