Sugar Outlook Plugin vs. RivaSync?

Does any one have any experience using Outlook Plugin and/or Riva to sync emails, contacts, meetings, calls? Would like some feedback RE: pros and cons of each.

Some specific points I'd like feedback on:

-Is there a way to categorize as a Call in Outlook so that it will sync to Calls Module instead of Meetings Module?

-How do users select specific emails to sync to Sugar?

-Do Contacts sync reliably? What issues have you seen and did you find a solution?

-Are there issues when users accept meetings on mobile devices when they use iOS native mail/calendar instead of Outlook App/Mobile versions?

Thanks for any feedback.