Part one of the question: How do you feel about titled chapters?
I, personally, enjoy titled chapters. Something in me especially enjoys it when a chapter title has a double meaning which can only be discerned by reading the chapter itself. I can't really explain it, but it's a lot like puzzling out a riddle. I thoroughly enjoy this.
This is definitely why I use chapter titles in my own books. This is also why my titles tend to have a second meaning, some of which can be figured out by reading the chapter, others which cannot truly be puzzled through until the entirety of the book has been devoured.
There is something about just seeing a 1 at the top of a page, or a 5, or a 27, which makes me cringe a little, and makes me sad. I feel slightly cheated, the same way I feel slightly cheated when I see a term paper at the college I work at with the title "Essay 4" or "Research Paper". Maybe it's just me.
On that same note, I generally have a very hard time concentrating when writing if the chapter I am working on does not have a title. I can't just go fill one in later. I need one now. If I end up changing that chapter name half way through, fine, but it has to be there.
Second part of the question: How do you feel about a chapter sharing the same name as the book it is in?
This is a more personalized question. The book I am working on right now, Hope of the Mirra has been a labor of love for about five years now, and for four of those five years, the final chapter was called "Sacrifice and Cycle" and, all in all, it really fit. It was a very dark book with a pretty downer ended. And then, last year, I changed the name to Hope of the Mirra (it was previously Mikara Falling), and the whole slant of the book changed. Yes, it is still dark, but there is hope at the end of the tunnel.
So, now that the book is nearing completion (draft 6 is almost done, after a long year of work), I have come to the realization that "Sacrifice and Cycle" no longer fits as the name of the final chapter. That chapter title implies that nothing has changed, and that it's just another cycle come to pass. That's not how it ends at all! This realization was horrifying (because I'd been set on this chapter title for four years) and liberating (it's been four years) at the same time!
Not long after I had this realization, I also came to the understanding that the best title would be "Hope of the Mirra", which really backs me into a corner. Is it cliche to have a chapter with the same title as the title of the book?