What do you like best?
Microsoft offers one of the most reliable and cost effective MFA solutions we could find. You have the ability to choose txt message, phone call or smart phone app for approving log ins. There is even an included self service portal for users to modify their own options.
Payment options are nice, you can buy blocks of users or Pay-as-You-Go based on the number of active users that month.
What do you dislike?
The initial deployment was confusing, the documentation was difficult to find and dispersed across several sites. We didn't receive much support during the deployment.
Recommendations to others considering the product
We could not find another solution that met our needs. It was surprising how few companies offered anything but a cloud hosted txt message only MFA solution.
What business problems are you solving with the product? What benefits have you realized?
Using the Azure MFA we are able to properly lock down our user's VPN connection. We have even implemented it on admin authentications to our security appliances.