I use the bass for allround music, Gospel, pop, jazz, rock. 
In my opinion it is quite lightweight under 4 kg i think. 
This is the 2'generation of Sandberg basses, and i think that these are better than the 1'generation.. why?? these are lighter, and have a better weight balance. It feels like the neck is closer to the body, and that results in a feeling that the neck i shorter than the 34" 
Any cons?? yes the first bass i got from Thomann had a fault in the electronics.. I send it back, and got a new one. 
So all in all.. I love this bass