The only issue I've had with Shadowplay is that it records at a variable frame rate. This causes audio to be slightly out of sync with the video when editing. There's a free program out there called Handbrake which takes the Shadowplay variable frame rate and converts it to a constant frame rate. I run videos through that before editing so there's no sound sync issues. Depending on the length of the video it takes my machine between 15 and 20 minutes to convert a 90 minute video. But other than that, like the others have said, Shadowplay causes no appreciable performance hit to my pc and is super easy to use.