you ever tried it Tea, Baboon? - Is it a good herb?
It's okay, a mild stimulant, no great shakes (figuratively or literally!) - thing is, it's meant to be used 'socially' but while using it you have a mouthful of semi-masticated leaves, so all you can really do is sit there and chomp in companionable silence.
That said, if you want to get some writing done and fancy an alternative to coffee, it's probably worth checking out just to see what it's like. Internet cafes run by Somalis (i.e. most internet cafes IME) are a good place to ask. I didn't find it tasted too terrible. Oh, and it's pronounced "chat", not "cat".