Jandd's Economy Panniers are an excellent basic set of bags for budget-minded cyclists. They have large main compartments, heavy-duty storm-flapped zippers, Scotchlite Reflective Material for greater visibility and a double layer of material to strengthen the bottoms. The handles on the panniers snap together making it easy to carry them, too.
Strengths: Bought the economy panniers in, as I recall, 1989, and they are still in semi-regular use.
The straps, the zippers, the rack hooks, and even the snaps that hold the two bags together . . . all working fine.
Weaknesses: Ummm . . . when I bought them, the price seemed high. This was 1989-ish. (It was probably before that, actually.)
We're 24 years on now . . .the funny thing about all the JANDD products I've purchased is that I know I will run out of use for them long before they stop being useful.