Birds need horizontal flight distance (better to have a wide cage than a tall one). This cage provides 62" of horizontal flight and birds love it! The ability to divide helps with splitting birds when fighting/breeding, catching them etc. I chase them to one end, slide in the divider, clean the other end and reverse.  

The directions are the worse I've EVER seen but the cages are worth the hassle (good price for great cage).  The company should post better directions on line.