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Full user review
Marginal interface improvement over version 3 with a little more flexibility to custom configure the browser interface
Version 4 has handles SSL connection set up with secure sites extremely poorly and frequently fails to establish a connection after the session times out or connection is reset.
In simultaneous tests using IE 8 and 9 alongside Firefox 4.0, IE immediately establishes a connection and I'm able to access secure banking sites. Meanwhile, Firefox either fails to establish a connection or takes over 60 seconds, after which the session attempt times out. Something is seriously wrong with version 4 implementation of SSL.