What do you like best?
The charismatic name (Yes, the name!) Sketchbook Pro, with its the clean, welcoming-to-art, no-nonsense interface with all the tools you need in the right places for instant access. All the drawing and painting tools with an intuitive learning curve. The very fast way of moving in and out of your artwork with handy shortcuts. The overall look and feel without copying others, that matches an illustrator's work environment whether digital or traditional. Its integration with tablets and phones with its own apps. I use it with my wacom tablet as this is, of course, the minimum necessary to harness its main drawing features such as pressure sensitivity and the lines you draw, but you can do a lot with a mouse too if you must. It is also great for black and white art, line art, comics, inking, the works!, which you can begin or finish your work in CorelDRAW/PhotoPaint, Krita or PhotoShop too, if you like.
What do you dislike?
The recent move in which you can no longer own the software, but only use it via "subscriptions" that must be renewed every year as Adobe and others are doing. I'm an "old timer" and like to own the things I use and not be bugged further. There should be an option for those who want to "work in the cloud" and those who do not, to purchase what they want and update when they want, with advantages for longtime users. That would be an honest and professional way of doing things, in my opinion, and that is why I have regretfully ceased using it fulltime, having declined from the offered subscription mode after a disappointing and bothersome experience to have it completed from my country (Brazil). It might be different for other users, of course.
Recommendations to others considering the product
Use it as an artist, though friendly, it is not intended for the curious to just dabble and solve some momentary or frivolous art need. Perhaps the subscription mode discourages those who would not use it seriously. However, If you're like me and happen to come accross the last legit standalone version, (I think it is 7.0.1 of 2015), purchase it, install and be happy!
What business problems are you solving with the product? What benefits have you realized?
I like to have it around as one of my professional tools of the trade. In this sense, I can illustrate whatever I want with it, though admittedly I have not explored everything that could be done, keeping mostly to my line of work, but I intend to learn more as I have more time to spare.