This is a fantastic little computer for the price.  I am currently using the factory installed Windows as my OS and I have installed Kodi to turn it into a media center PC.  I did notice some issues with streaming content over the internet, whether it was YouTube, Amazon Prime or Netflix where the video and audio fell out of sync.  This would happen after about 20-30 minutes of streaming content.  I have since upgraded the ram to an 8GB stick and that fixed my issue.  I would have to say that this is a mandatory upgrade for this PC.