Q. If one receives one of Maimon's books, such as Sarei HaMaios, for a Bar Mizvah gift, what shold be done with it?
A. It should be burned – these books are worse then “Chazir”.
I am not certain if Maimon's role as the propounder of the “Sanhedrin HaGedolah..” and subsequent controversy with the Brisker Rav (leading to the following “clever” retort by a prominent Rabbi – His name (his original name was Fishman) ought to be read with a Mapik.) Or if it is the very strong pro-Zionist bias in his books (for some reason all of the Rabbis he discusses were in some way favorable to Zionism).
In a short favorable review of Sarei HaMaios in Talpiot, Prof. S. Mirsky decries Maimon's decision t leave out the sources (and see note 3 here). My own opinion is that Maimon left out the source because he had none. In his books he writes that he had the custom when visiting any village of conversing with the older inhabitants for any village lore on the famous Rabbis that lived in them. As such, these stories are often unreliable (as anyone familiar with this genre knows, names of famous Rabbis tend to be switched around – the same story (Selling Olam Habah for an Esrog Mehudar, etc.) for instance is told in the names of the Baal Shem Tov, Kedushas Levi, and somewhat ironically, the Gra) but one cannot discount them entirely.