I have owned 2 Modulus basses, I had a M-92 5 string fretless which is one of the "sweet spot" basses, and I also had a fretted Quantum 5 SPI. Both basses were bolt on design with the graphite necks. I would interchange the necks from time to time just for kicks. They were both heavy, and mine being from the early 90's did NOT have the adjustable truss rod. The M-92 had a single soap bar style EMG active 18 volt system with separate bass and tone controls. This bass had a great sound and was gorgeous. It was candy apple red with a white pearloid pickguard and gold hardware. The Quantum 5 SPI had an ash body with a cocobolo top, gold hardware, two Bartolini soapbar pickups with a 9 volt preamp, bass, treble, blend and a midboost switch for controls. Again, another stunning bass to see!! The tone of both of these basses was a modern type of tone. They sounded fine, but I didn't like the playability. The early Modulus basses didn't have a truss rod, so if you didn't like the way the neck was set up, your only adjustment was string height. I was happy with these basses for only a short while. At the time I used Ken Smith strings. These basses had a 35" scale neck which created a problem with my choice of strings. The strings had the silk windings on the ends like a lot of strings do. The problem was unless I cut the silk windings off of the strings before installing them the windings would be over top of the nut. This deadened the tone, and created a bit of extra hassle changing strings. The easy solution is change brands of strings to a type without silk windings. My problem was I had already bought a case of Ken Smith strings $$$$$$$$$ I never had any other issues with the basses, they were well made and looked great. I cannot speak for the newer basses, but I am sure they are nice.