BTW, the page is inconsistent as to whether the volume goes out to Defenders #15 or 16.  The cover mock-up says 15, but some of the text says 16 and the cover line-up at the bottom includes 16. 

My bet is that 16 is included b/c it is the second issue of the two-part Magneto story. 

Reading now:  White Tiger mini-series; X-Statix Omni
 
Awesome new acquisition:  X-Statix Omnibus (still waiting for my copy of Marvel Firsts 1960's to arrive, I'm sure that will qualify)
 
...with great power comes -- great responsibility!