I bought this case for my OOO size acoustic.
I have brought this case on four flights, luckily each time i've been allowed to carry the case on board, which is a testament to its size.
The case has a very nice green plush interior. There is a small compartment located under the neck, which is large enough to store a couple of packets of strings, a few plecs and a maybe a small tuner, but not much more.
The build quality seems to be quite good. The four TSA latches are quite bulky and sturdy looking. My case has taken a small bit of abuse, a few falls here and there, but has held together with no signs of damage, and more importantly has kept my guitar in perfect condition!