While viewing some programs On Demand via Sling TV utilizing my Roku Device ID 213O8C351544 with Serial number YHOOCM351544 I'm not permitted to Fast Forward through a commercial advertisement. During my attempt the following message was displayed: "Video controls are restricted during Ad play". There was no change to this behavior after updating the Software, etc.
By Sling TV enforcing video restrictions during Ad play for Roku users, by preventing users from Fast Forwarding, Rewinding, etc., during Ad play, this removes a significant benefit to own and operate a Roku device.