While "good feature" can be subjective depending on your needs, the primary benefits of using a compressed PDF like this one include:
: Zoom in on any photos or diagrams to ensure they aren't overly pixelated.
: Smaller files are much easier to send via email, as they are less likely to hit attachment size limits.
: Ensure the text remains crisp and searchable, rather than looking "muddy" or like a blurry image.
: Many modern compression tools use "lossless" methods that shrink the file size without visibly degrading text or image quality. How to Check Compression Quality