In a recent flight trip written up in the Pilot or Flyer one of the most impressive things using SkyDemon was filing a flight plan from the cockpit in the middle of Morocco after being refused take off clearance and told to taxi back and refile a VFR FP due to track request errors. Using the 4g connection and SD they refiled siting on the taxiway in less than 10 minutes. ATC very surprised that a new FP popped up on their system so quick.
So I would say to get the best out of SD or FMS an Ipad or Android with cellular and a good data package is a good idea. A separate GPS with dual system may be a good idea to cover GPS drop out as well.