I have not purchased the original one-volume Kagero Monograph (#41), so I can't comment on what was repeated from that in this publication. In the 110 pages, only 25 are text on the operational use of the plane. These pages are very well illustrated with photos, many of which are completely new to me. (And I've been a modeler since the mid-60's.) The majority of this volume (as opposed to HEINKEL HE 219 UHU VOL. I (Monographs, 3d Edition)) is dedicated to 3D CAD model illustrations of just about every aspect of the 219 inside and out. These are of photographic realism, and achieve a sense of the construction, armament, landing gear and crewstation design that simply could NOT be done in any other way. You really have to see these to appreciate the realism. Also included is a large (approximately 32" x 23") two-sided sheet of 1/32 scale plan and side views with details of the cockpit, Revi 16B gunsight, and DB 603A engine. There are no color profiles in this volume.
HEINKEL HE 219 UHU VOL. I of the series has 94 pages with 29 of them also being similar 3D models of exclusively the main elements of the crewstation, ejection seats, armored glass and main instrument panel. Volume 1 also has 13 pages of photos of the restored Smithsonian bird and both 1/72 and 1/48 line drawings.
The two volumes together present the most comprehensive reference I've ever seen on the He-219, and if I were going to build the Revell or ESPECIALLY the Zoukei-Mura model, I would consider both volumes an absolute necessity.
I give it only 4 stars because there isn't a word on the evolution of the camouflage of the 219 in either volume. The value of the two volumes is excellent, but without ANY treatment of the assorted versions of camouflage this ground-breaking aircraft wore, I was left just a bit disappointed.