Anyone tried Bernard's Black Avalanche ?

Hi,
I plan to get this beer in my bar (with mixed azote/co2 system), but there's no reviews about it.
It seems that using mixed gas gives an amazing visual and very nice texture.
I tried it once in 33 cl bottle and it was great for a dark lager, unfortunatly it's almost impossible to find on tap in france...
Anyone of you ever tried it an tell me more about it ?
Thanks !
http://www.bernard.cz/en/beer/assortment/draught-beer/10.shtml