The first stages of the interview, i.e the screening begin to get you very inspired to work for the company. The icing on the cake comes when you actually get called into their offices for more detailed interviews, like code pairing, psychometric and logical assessments. Though this is the most difficult stage of the whole process, to say the least or rather put it mildly, it is an uplifting process, i think personally within ten minutes of commencing the process i had concluded that if ever accepted to work for TW, i was prepared to let go of everything that i thought i knew(granted it wasn't much), but the guys that you interact with in this stage of the interview process, just make you feel anything but smart in a very positive way, you feel inspired to really begin learning to develop(with them or not with them, but all the same inspired to up your own personal software development game).
Overall though it is an extremely difficult interview process, however it leaves you more inspired than dejected...and i would not have it any other way. I think for me, i was totally overwhelmed and intimidated by the whole experience, and at the same time their visions and values are very inspiring and in a few words demonstrate that they are a people centric organization as compared to being profit driven.