It should be noted that AZM doesn't design their own models. The different WWI plans being sold (and kitted) were designed by a range of different designers -- some very well-known and respected and some not so well-known. For example, the "AZM" Pfalz DIII is Tom Polapink's (contest winning) design. I believe the Hansa-Brandenburg was designed and prototyped by John Cole. In some cases, AZM may be the only ready source for these plans. In other cases, the plans are easily available elsewhere.