Use it without worries of lincensing
What do you like best?
The best thing of Pixabay is it's licensing, they do not stop you to use their stock images for commercial use. You can use these images or photos from personal to commercial use without paying anything. They appreciate the attribution but it is even not forced, like other online tools.
What do you dislike?
You may not find any result for many important and widely used keywords, means less image stock than paid ones. Each image can't be downloaded in the illustrator or svg format. There are pre defined sizes of each image, you have to choose the size out of these only.
Recommendations to others considering the product:
If you require good quality of images or graphics for any type of project, whether it's non-commercial or commercial, Pixabay could be a nice source to complete your graphics requirements.
What problems are you solving with the product? What benefits have you realized?
We use Pixabay images for various projects of our organisation and Me too use them for my personal project. Many of them are similar to paid stocks and of very high quality. It helps in savings of some bucks. We can get good quality of graphics without paying anyone.