What do you like best?
Debian is stable, with a great community, you can find 'how to' for whatever you want, it is perfect as a server operating system.
It is an old distribution with many users and contributors around the world, and it is used as base for big desktop (and server) distribution like ubuntu.
You can easily follow the upgrade of the system without needed to install again the whole system.
You can also find experts to help you if you need training or services.
And it's free !
What do you dislike?
If I need to dislike something, sometimes for the stability purpose some software are kept back to an old version and we need additional repositories to enjoy new features.
Recommendations to others considering the product
If you need a really good, stable and followed operating system you can go with debian blinded, it is not the most simple as desktop OS, ubuntu, based on debian is great and you are with a derivative, so debian is still here.
You can easily work under debian in a virtual machine if you work as a developer and automate a lot of thing with ansible (and vagrant for the development environment setup).
You can deploy debian in almost all cloud platform and the mentality is conservative enough to assure you the stability you need for a business.
What business problems are you solving with the product? What benefits have you realized?
Every time I need to host a service I use debian as my OS, websites, services like xmpp, or email server.
It's free, when you have learn to use it, it costs you nothing more, it's a huge business quality.
You can spend more money on human resources instead off paying big prize for licenses when you can have one of the best product for free.