This is a rather niche book for obvious reasons, but if you're interested in O.W. as a person, this is an excellent read.
Yes, aside from the introduction given by the author where he explains how/why he stumbled upon all the quotes, anecdotes, and extracts collected in the book there is a Grand Total of Zero context for anything, but personally I enjoyed that. I took time to research the people who spoke of and to Wilde, if I was curious. I do also own O.W.'s biography written by Sturgis which probably made the research aspect easier, but yup, I enjoyed it a lot.
This is a fast read as it's basically just quotes, but taking it slow gives you time to absorb and process what you've read, so I did just that.
Basically excellent read if you want to spend some time just perceiving Oscar Wilde.
The entry about his funeral genuinely made me shed a tear, so just to give you a taste:
"When, on entering, we three women took our seta at the back of the chapel, I was surprised to find it practically empty. A few men were scattered about. There were then no other women. Even after the coffin was brought in, followed by Robert Ross, Reginald Turner, and Lord Alfred Douglas, and a few men whom I did not know, the chapel still looked empty."
[...]
"It was tragic to realize that this man, a poet of parts, once a brilliant figure in Paris as well as London, the dandy of dandies, this lover of the beautiful, this amateur of luxury, so few years ago known to all the great men in the world of letters and fêted even by those who did not love him, had fallen so low that only these few cared or dared to do him honor, and speed him on his last adventure."