It took me a while to understand the purpose of nursing tanks.  Then I realized, if you want to nurse in public and show as little skin as possible, nursing tanks are necessary.  However, having to unclip a bra AND a tank is tedious and awkward, especially when trying to hide yourself in public.  Enter this tank - it clips to your br so you only have 1 clip to mess with.  It lets me wear my favorite nursing bra (underwire and all) and not mess with tons of extra clips or layers.
Only drawback is that it is super long, which isn't cool when I want to tuck it in.  Also, sometimes it sags a bit in back because it only clips to your bra at the front.  Otherwise, it works great, washes well, and does exactly what it should.