Full Disclosure: I'm a huge fan of Sidney Sheldon. I own most of his books (though I recently discovered, I do not own this one - go figure). I also read most of his books in high school (a long long time ago, before I discovered "literature"). Finally, you will notice that, as much as I adore him, none of his books made my Desert Island list. Given all this, let us proceed.

Sidney Sheldon does one thing really well: revenge. I've yet to read anyone who can plan a dish served as cold as he does. Intricate plot details, fascinating facts, lush locations - it's all there. He really is pulp fiction at its best. I clearly remember loving him so much in high school, I used to rummage through the library books sales hoping to find one of his books (I collected all but this one by the time I graduated). I don't remember ever "liking" his main characters (who are, with few exceptions, always women), but I didn't hate them either. They lived glamourous lives and were so clever and charming, I aspired to one day be like them.
Upon re-reading: Tracy Whitney? She's grating. I don't know - maybe everyone called everyone "darling" in the 80's, but it seems so fake to read now. With the exception of her incredibly calculating mind, she's fairly wooden and I actually didn't like her at all. Frankly, I didn't like any of the characters, who seemed to be more like caricatures. Some of the language is stilted and the diction leaves much to be desired (I quote: "I'm so lucky to have met such a handsome fellow" ... can you picture an American talking like that?). It's almost like her actions didn't match with her personality (like a bad actor reading an amazing script).
I will admit - I was having a TCM*.
However, having said all that... the plot is still fantastic. You have to keep it in context (dial-up modems and airport security don't seem to stand the test of time) to fully appreciate its intricacies. And, though I had read it before (I was thirteen the first time), I was still engaged enough to actually read the entire thing in one sitting (four and a half hours were not wasted at the mechanic's). So, if you can get past the flaky bits, I recommend Sheldon for soon-to-be-here sunny afternoons at the cottage or on the beach. But, may I suggest you start with Master of the Game?
* TCM = ThunderCats Moment. By far, my favourite cartoon growing up was ThunderCats; indeed, I had my head shaved for drawing spots in black permanent market all over my hair and forehead as I tried to emulate Cheetara. When I saw the episodes had been released on DVD, I couldn't wait to watch them again and bask in their glow. Alas, they tumbled hard from the pedestal of my memory and I couldn't watch more than two episodes. Ever since then, I avoid reliving anything from my childhood (G.I. Joe, Fat Albert, the Omen) just in case history repeats itself (or fails to, as the case may be).