I recently received a number of packs of Commercial Brood Premier Foundation (10 Pack, Wired from Donegal Bees, as part of the wax exchange system. The wax was fresh, clean and robust. I wouldn't hesitate to recommend Donegal Bees foundation to beekeepers.
They appear to be very substantial. I'm very happy with them. I've heard no complaints from the bees. Thank you. Service very prompt