What do you like best?
I had a formal education in arts, that means I used charcoal and graphite and paint, and worked over paper and canvas. Painter is the best software to my knowledge that replicates all classic artists materials.
It provides a really broad whole range of materials and different specs for every feature, allowing the user to change and adapt the tools for their better use.
Even though, if the user doesn't have experience with analog materials, Painter becomes a playful and dymanic software.
another feature, really important for an illustrator is that you can swap among Ps and Painter, coming back and forth as long as necessary, so the user can start a project on Painter or PS and it doesn't affect the finished piece.
What do you dislike?
As I mentioned the swap between PS and Painter. I would like that it would be more fluid and organic, easier to swap, still it's a pretty good option.
A problem it has sometimes is the brushes, specially the ones the user modifies can get damaged, and start behaving differently. It requires a good reset of the program to fix the issue, but still, took me a while to notice that.
Recommendations to others considering the product
A great tool, but in my experience is better, as with many users, to use in addition to other programs.
What business problems are you solving with the product? What benefits have you realized?
Depending on clients necessities or style chosen for any different project, Painter gives me the freedom to replicate any classic or analog material to give a bit of an edge to any illustration.
Many times I will upload illustration made in another software and give that extra push with Painter, which will make the illustration properly finished.