The interface was very intuitive with clear explanations of how it works - no need for trial run! I am not sure if its accuracy may vary depending upon factors like resolution/network speed etc but as per my understanding when i use this tool from remote location via VPN all seems fine (i mean there are few slight discrepancies during data collection).
Nothing much liked so far about using insginal till now though nothing too bad noticed either at least yet! As said before we can test our app without actually uploading or publishing them online which helps us save time & money while also getting feedbacks faster than any other method out here currently used by most people who make apps these days!!