I've used 'em. In fact, my two main basses are strung with 'em right now.
They're a good, solid-quality string. Tone is fine, longevity is decent. And as you say, the price is right.
FYI, I've got a couple spare sets for sale right now - cheap:
FS: Just Strings brand roundwound nickel strings - light gauge
Only reason I'm selling 'em is because I've decided to change to a different gauge, and I'd prefer to get some $$ back on these, so I haven't wasted my money. If you want 'em, PM me...
MM