What do you like best?
The system is well centered around swipe gestures and touch points - positioning of the buttons, vertical scrolling, etc. The home page is very user friendly and very customizable for each users taste. Battery management. Windows Phone price. In addition, Lumia phones can offer a very good image quality of the pictures that have been made with the camera.
What do you dislike?
Lack of applications in Windows store. Internet Explorer and bing search engine is a default browser on Windows Phone. I think it is clear that Google search, Gmail, Youtube, Google Maps, Chrome, etc. are the dominant online services and even if this is a Windows Phone I think it should use the most popular online services as default Windows Phone online services. Navigation could be more precise.
Recommendations to others considering the product
The classic Lumia design is present with its gorgeous polycarbonate shell and gentle curves, but you also get extras you won't find in other phones, like microSD compatibility. Sure, it might be a "deal breaker" for some, but if you're a fan of big screens, you can't go wrong by choosing windows phone.
What business problems are you solving with the product? What benefits have you realized?
I use my phone as both business and personal phone. It works fine when making calls, sending texts, checking emails, social networking, listening music, reading news, checking weather forecasts, making a high quality images.