Not really what one would imagine of a real 'jazz club' :)
Then again, we are in Doha.

That being said, it is a well laid-out, very modern lounge-style bar. There was nothing wrong with the service that I encountered, of course, always keeping in mind that this is Doha, not the capital of the highest standards in service :)
The band is rather good, really (I can see the guys playing great sets in real jazz clubs), although the choice of vocalist is obviously because she is eye-candy material.
The cocktails are good, the wine list is small and the liquor list is average. Prices are like at the W bar, perhaps a little less.
The biggest down-side was the sound system. They need a good audio engineer to fix that asap :)

Overall, a good place for a drink and live music fix.