Nice little app

Does exactly what it is advertized for, and was what I needed for my purposes: I needed to merge several PDFs and to reduce the file size (the PDFs contained some sizable images) without apparent quality loss. The resulting file size was smaller than the sum of the sizes of the individual PDFs and the images still looked good.
One issue which you might want to know: When merging files, you might need to run the PDF shrink option separately afterwards to obtain small PDF sizes, this happened to me, but shrinking worked very well.

Excellent tool for the price I paid ($1.99), recommended.

Unvlad about PDF Toolkit +, v1.8