I have a Jabba Classic 5. I upgraded to birdseye fingerboard, 18mm spacing (which meant Delanos) and their three band eq. The build quality and attention to detail cannot be improved upon! Really top notch. The sound, however, a different story. The Mayo 3-band eq is horrible IMO, and I really didn't like the Delanos (personal taste). So in went Bart B-Axis, and East Uni-Pre. NOW it is the bass I hoped for!
Oh, I also have a Vigier. On par with that!