This is not to say that you should rely on me for the time of day, much less anything else, but I can say this:
I started studying up on Epicurean philosophy intensely in 2009, and have made the study of Epicurus my number one "hobby" since then. I have some personal differences with a few of DeWitt's interpretations, but I have not over that time found any single work that comes anywhere close to "Epicurus and His Philosophy" in presenting an understandable, well documented, and perceptive presentation of the big picture of Epicurean philosophy.
I don't want to oversell it because a lot more work needs to be done to expand on what DeWitt has started, but there's really nothing like EAHP in terms of an overall understandable introduction to and presentation of every major branch of the philosophy.
I give "A Few Days In Athens" high marks as well in the "sympathetic to Epicurus" department, but that is a much more narrowly-targeted work. Other than EAHP I am not aware of any book that I can wholeheartedly recommend to the average reader who says "I want to know what Epicurus was all about."
For professional philosophers and people who have a lot of background, there are many other good books with many other details, but not of a general nature like EAHP. And I would not dare send someone new to a collection of Epicurean works, even "The Epiurus Reader" or Bailey's "Epicurus The Extant Remains," until they have the general introduction that DeWitt provides.
Even starting with the Principal Doctrines, or the Vatican Sayings, or any of Epicurus' letters, is in my experience going to lead to too much confusion to start off with reading those.