Edmund Morris reminds me a lot of Robert Caro (author of The Power Broker and the biography of LBJ). His research has been excellent (which takes much time and requires us to wait for following volumes) and his treatment of TR is very objective. If you've read "Theodore Roosevelt: A Life" by Nathan Miller or "Morning's on Horseback" by David McCullough, and are fascinated with TR's incredible will to overcome his serious health issues, maximize his performance in whatever he attempts and achieve personal success through leadership -- then there are many additional details of this man's journey in this trilogy. Three volumes may be a bit much for many -- in which case you should start with one of the two biographies I mentioned. But, the surprise in the three volumes is that, like Caro, Morris has an engrossing way of writing which, if you didn't know better, you might think you were reading a novel rather than biography.