I can understand why folks might want a third-party sharpening tool for the input sharpening (LR Details panel) and for the artistic sharpening (LR adjustment brush). However, for the output sharpening, I am not seeing a need for third-party sharpeners in any of my workflows.
IMHO, LR's Global and Local Capture Sharpening tools in the Develop module are excellent. The Export and Print module Output Sharpening is designed for screen images and ink jet printing. If you are exporting images for offset printing the Output Sharpening results will be good, but less than optimum. How much of a difference you will see on the printed page is questionable. I've gotten excellent results using LR's Matte Standard Output Sharpening when resizing images for Standard paper Blurb book printing (HP Indigo 5000). Other types of offset printers and paper (newsprint) may not fare so well.
When Exporting images for any type of print output it is important to resize the images exactly to the layout dimensions (in, cm) at the target printer's resolution (dpi). If you don't the images will be resized again by the printer engine, making your "precise" sharpening all for naught!
I was thinking to apply output sharpening in Lr, but later I decided not to change my workflow.
Thanks a lot for the inputs.