I have been using these labels for over a decade now. I love 'em and so does the printer. My labeling software is set up to use the format and does so with regular accuracy.
Have been using these labels on catalogs for a small business for a number of years. Use MS Word to create and save the label. I can then print however many I need 10 at a time. Labels are printed in color on an HP Officejet (Inkjet) printer. They work great.
I began using these shipping labels because the ones I use to use (1.5 x 2.5 - normal mailing labels) must have been to small for postal workers to see. They continued to misroute my Priority Mail to places unbeknown to me. A 2-3 day package usually took 5-12 days! These bigger labels seem to work. So far the 3 packages I mailed went straight to were they were supposed to and not on a side adventure.