I read Aleph Shin and enjoyed it. The plot definitely took unexpected turns but at some point I figured out what would happen at the end.
Personally I can’t say how well researched the book was as I am unfamiliar with the streets in Iran, the flight controls on a fighter jet, the different chambers on a submarine and the geological makeup of the ground under the Aswan Dam. I am basing that on what other readers wrote. I did enjoy it and found it addicting.
I did not read the other three books.