What do you like best?
So I used to use Photoshop and Illustrator CC exclusively, and even when it came to web design, I primarily liked to stick to these products to get a visual feel and hire a developer to create the actual site for me.
Sketch actually made this process really simple for me- I don't have to worry about making dummy content, its plugins really help you create what you need and lets you expedite the process.
What do you dislike?
One thing I don't really like about the software is that the hotkeys are different from Adobe products. I understand it's not Adobe, but I wished hotkeys were universal.
Recommendations to others considering the product
Just get it, it'll make everything easier in terms of UI design. If you're doing more print work, you don't really need to venture into it as much.
What business problems are you solving with the product? What benefits have you realized?
I'm currently doing all wireframing with Sketch now. I create UI designs exclusively on Sketch and stick with Photoshop and Illustrator for more print related work.