We use these labels in very high volume so price is a real consideration. These are less expensive than the brand name labels and they work just as well in both my Xerox and Ricoh laser printers. I haven't had any problems with smearing jamming etc.
There is a big difference between the Staples laser labels and the Avery. The Avery is on much thicker paper which may be fine for some applications but I prefer using the thinner Staples stock.
We use these labels every day. We put them on our products for sale. When wee pull merchandise from the fresh freezer colored ink spreads and/or runs (note the BLACK does not). Also do not stick well while in the freezer.