Best part is most of their stuff has cad files on their website. Working at a company where everything needed a drawing, being able to email the cad team like "hey, I need to swap part 15 on fixture 12345678 for this other part. Drawing for new part is attached" was a god send as I would get the drawing updated and sent back in like 10 minutes.
Also 1% discount means nothing when grainger is anywhere from 10% to 2000% more. My company did one worse and made a deal with a 3rd party who mainly purchased from grainger. So what we were supposed to do was go to grainger.com find what we need, copy part number, go to third party site, fill out a form including part number, wait 48 hours, get a quote from third party, go onto another site to request purchase, wait for boss approval, depending on cost wait for their boss's approval, finally click purchase button, wait for shipping, receive part directly from grainger in grainger box. It lasted about 6 months before it was reversed.