Our office used to purchase the reinforced folders but to save money we switched to these with the non-reinforced tabs. They work just as well and hold up fine even after several weeks of constant handling. I would definitely recommend trying them out.
If I wanted large sections of left tabs or center tabs or right tabs I would buy the folders that way. When I buy assorted tabs it means I want them Left-Center-Right the way they're ultimately filed. I grit my teeth and curse Staples (they used to come sorted) every time I open a box and have to hand-sort 250 files.
I have been purchasing these folder for years from Staples BECAUSE the box was collated. Since my last 2 shipments were NOT collated I will be searching for another provider of these folders. I agree with the other comments it's a pain in the butt to stand and collate 250 folders!