I tested it on a few documents with embedded images and tables, and the compression was 75-90. For comparison, using "7z" compression on the original files yielded about 10 compression. Excellent performance and a clean interface. The nag screens are a negligible annoyance in return for something that is so useful.
PDF files are generally pretty efficient sizewise. But if you really need to shrink them and it's a large file and you avoid zipping them then by all means do this. The amount of compaction isn't consistent but it clearly works for very large files better than small ones.
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