I used it for the Azure credits. My "startup" only needed a single instance so I really didn't spend many of them. I tried to get into the longer program but the form was broken in typical Microsoft fashion and kept looping over business verification, telling me I had to input my DUNS number and incorporation letter, then forgetting and throwing it back to that step.

Back in the early 2000s the company I worked for was a small IT shop and MS software reseller and the MSDN subscription included everything. I remember setting up Windows 2000 advanced server as my home network's router.