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Usable on Mac, Windows and Linux.
Pro Includes collaboration tools
Allows designers and developers to view revisions and interact on the fly by posting comments on the revisions instead of going through multiple e-mails back and forth.
Pro Sketch and Photoshop support
Contains plugins that allow designers to share any designs with developers.
Pro Offers a 14-day free trial
Allows users to be able to get comfortable and familiar with the service before signing up and paying the subscription fee.
Con Subscription fee
After the free trial, users must set up your account with an option of their 3 subscription services - Garage, Business, and Enterprise [$8.99, $12.99, or TBD]. The cost is low, but monthly.