It's a 3M product, what more is there to say about the quality? They're the industry leader in every thing they do, even my co-workers Miller respirator is actually made by 3M. Where something is worth saying here is the price. Home Depot wanted $37, Lowes wanted $40, and Central Welding Supply wanted a little over $20! I saved a huge percentage of money ordering it here and it's EXACTLY the same product.
Update: Filters got here today, they're a little bigger than they look, but they fit under all 3 of my welding masks, including the ESAB Sentinal A50 digital.