[WWI] Opinions on Osprey Books

[Old Fokker]

Anyone have any opinions on these Osprey books?  Just wondering if they have 
a decent sampling of profiles and good photos.

1. Austro Hungarian Aces of World War I
2. American Aces of World War I

Or if you have any other suggestions for good reference books on 
Austrian-Hungarian aircraft.  I'm looking for markings and info on the 
Phonix D.I in particular.

Thanks,
Paul