Mixed. They do their job, but you can definitely tell that it is an Indian team behind. Everything is "yes, of course" and then maybe something happens. Or maybe not. Plus they are very set in some formulaic ways - if you want to write a book, it has to fall into some already defined slot for which they know how they want organize it and then they insist on their way (how the content should be structured, what is allowed and what not etc). That is helpful, but also limiting and frustrating.
Most of the time it works the best if you also say "yes, of course" and then do it in your own way. 🙂
Technical staff and editors are mediocre, at best. They definitely will not catch all errors.
So - if you are looking for a perfect partner, they are not the one. If, however, you can just say "eh, whatever" from time to time and move on, they work just fine. They do pay on time, though.
As for the other publishing houses, I have no idea.