I began using NXPowerLite roughly four years ago when I found myself having to send a 300-slide 8 1/2 MB presentation to a corporate client for a class I was scheduled to teach. My email system was unable to handle an attachment of that size so, after doing an extensive search, I found this product. I ran my presentation through NXPowerLite and reduced the file size down to around 4 MB. I've used this product ever since, anytime the size of the file becomes unmanageable. I also use it for photography. For instance, I recently reduced at 11 MB JPEG file down to 3 MB. In neither case was anything different in the final version. This really is a miracle product. I highly recommend it.