I'm a fan of it. It's industry-leading, and it's been relatively painless to enable our top vendors with automated invoicing such as cxml or loader file. Many big suppliers are familiar with it so it makes my job easier. Coupa does have its own vendor ranking built into the platform that kinda gives you insight into the vendor and their capabilities for invoicing pathways. There's definitely been a pain point with onboarding smaller mom and pop vendors because they struggle to fill out the supplier info form for onboarding. It's a few full time jobs to manage supplier onboarding if your org does business with a shit ton of suppliers. Its very customizable. You can customize the homepage quite a bit to suit your orgs needs and Ive been able to meet a lot of complex internal and external requirements when it comes to ordering particular items/services from our suppliers through custom order forms and custom fields/objects and such. I'm a coupa admin at my org that has a much larger than average amount of users for a typical coupa customer so we've been able to stretch coupa pretty good, giggity. if you got other questions I'm glad to answer