Sorry to contradict all the other reviewers here, but I found this book predictable, even while recognising that it's a book of a certain era.
The conclusion is a real disappointment. You can see what's coming from about half way into the book. The fact that the central characters are so accepting of the revealed situation at the end is also completely bizarre! It's very difficult to explain further without giving away the story, so I'll stop there..
This book swings between gripping and dreary.
It's at its best during dialogue and key events in the story, but his descriptions of future architecture tend to be both numerous and overly verbose for my taste.
That said, there are a few places where his comments on the trends of future society are remarkably prescient.
If you take the time to read the forward written by H.G. Wells himself, you'll see he readily admits to it not being one of his greatest works. Compared to his other novels, he has a point. But as a book in its own right, it's definitely worth a read.