The idea behind this software is not bad. The wifi connection between the phone or iPad is easily established and seems stable. Image transfer works seamlessly. This would be the one star.
However:
When uploading multiple images from the D5500 to a mobile device, only photos with VGA (seriously?) resolution or an "optimized resolution" jpg (screen sized res) are being transferred. In order to transfer a full resolution image, only one photo at a time can be selected and imported.
I am not sure who the target or what the target application for this is. For me it falls under the category "useless".
Remote camera control is clumsy at best. At this point however I already lost interest in the app and exploring its "possibilities".
I hope this is not the best answer from Nikon to the mobile workflow, or phones will eat their complete lunch one day.