Strangely, I used these in conjuntion with a set from Home Depot - called the same thing, look exactly the same, but one number different in the serial number. The Home Depot set gave out after an hour, while this set lasted 3 (by give out, I mean I was gasping for air because the filter media had become clogged). Even the "fresh" experience was different, breathing was much easier right out of the box with these. No idea what the difference would be, the price wasn't much different either. Anyway, if you have to choose between the two, pick THESE!
As a side note, be sure to read the data sheets on these types of things before starting your project. They will let you know what they are safe for and not safe for - don't rely on comments or reviews for the information!