At the time he was writing, Heinlein's books were so much better than all the others because he was so much smarter than most other writers. He thought things through first (which many others did too), but then he added an element that many other sf writers didn't (and some STILL don't): humanity.
Dan Davis, an inventor, narrates the story. He's a brilliant inventor and has come up with some pretty amazing gadgets, including Hired Girl, a robot who cleans, sweeps, vacuums, mops, and generally works all day long without supervision. Dan's problems begin mounting when he learns he's been betrayed by his partner. And to add insult to injury, Dan's fiancée is in on the betrayal as well. As if betrayal alone isn't enough, the two conspirators have Dan placed into a 30-year suspended animation. Dan wakes up 30 years later and is focused on one thing: revenge.
Now lots of authors could have taken the above premise and come up with an entertaining story. Heinlein did this and much more. He shows us that change (for individuals and for all humanity) is difficult, but not impossible. The future is full of challenges, but no matter how much technology changes, no matter how much language, currency, and trends change, man's basic instincts and attitudes remain constant.
Heinlein also tackles the implications of time travel better than anyone else from this period. (The book first appeared in 1957.) The problem of time travel is well thought out and logical. (Wish you could say that about every time travel story.) If you haven't read Heinlein, or if all you've read is 'Stranger in a Strange Land,' 'Starship Troopers,' or 'The Moon is a Harsh Mistress' (all great books), treat yourself to a fun, intelligent read from one of the true masters.