I like other services better.

It is silly not to think and work mostly toward making a relationship successful.  It is irresponsible not to think some about how to deal with break up.

Your data will be available in standard accessible form. Drupal CMS, SugarCRM, Google Calendar, ...

You will not be locked in to ITA or any other vendor.

Making it fairly easy to part ways exercises a wholesome discipline on both parties.