1. There is no such thing as a "literary product." I'm not sure why anyone thinks this is clearer or more elegant than "a novel" or "a memoir" or "narrative non-fiction."
Clarity and specificity are your friends. "Literary product" is neither.
2. "Research for an agency to represent my recently completed novel disclosed your listing which indicated an interest in high-concept thrillers." Find the subject of this sentence. When I can't parse your sentence....no wait, when I START parsing sentences in your query letter, particularly if it's the first, that's a sign of Trouble with a capital T which rhymes with P and that stands for POOL. Right here in River City.
Oh wait, sorry, parsing sentences always makes me think of this River City, Iowa.
3. "I'm writing about Topic A which has also been written about by distinguished names such as Stephen King, John Updike, John Barth, John Irving, Philip Roth, Jeffrey Archer, Paul Auster and Thomas Pynchon."
It takes a particular kind of hubris to include yourself on that list ever, let alone in my incoming queries. You're much better off just telling me about your book. If you're as good as any one of those guys, I'll notice. Me and a whole lot of other people too.
4. "Hello, my name is Inigo Montoya." This is the writing of a grade-schooler. Business letters do not start with "hello my name is (whatever your name is). To state the obvious: it's instantly off-putting.