I can't write much about the development part because we didn't hire them for that. But the quality of their design services is above question. I'm also positive about their collaboration and project management. Wishing them a good future.

Understood our requirements and submitted the work accordingly within a week as agreed
Delivered the UI designs at a fair price as promised

Initially, I had some difficulty communicating with them, but they overcame that sooner before it became annoying to me. So, I think they can take cautions to prevent such issues in future.