I like to play in a standing position, and with straps taking the weight of the guitar, but often that wears me out as I play for hours each day.
The 30" stool is just about the right height that I can rest on it, without really being in a seated position, so it suits me perfectly, and of course I can sit on it conventionally whenever I want, and the foot bar all around makes it more comfortable.
It's also very easy to build, though I'd recommend using your own Allen/hex bits and sockets in a screwdriver, rather than the little spanners and keys provided, which get really painful on the fingers when tightening.
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