I've never found a bass distortion unit of any kind that provides the kind of electric bass guitar distortion I like the hear. Other than a DIY unit I rigged up (not for sale BTW). I prefer to hear speaker distortion over electronic or tube distortion for the bass myself. A smoother, rounder sound.
In addition, to date every single distortion I've ever heard that claims to be "Geddy-esque" sounds like a bucket of a$$. Top-end fizzy crap or low-top-end "sizzle" just sounds bad to me. Bad bad not good bad. It only sounds good to me if you roll off the top all the way down to roughly 3 or 4khz AFTER it's been distorted. However, most treble controls aren't voiced that low. So I had to make my own stew.
I've resorted to using low-cost tube mic preamps or a half decent DI as an input stage to keep pickup loading consistant (aka "input impedance") followed by a combination of using DIY distortion rigs with an array of several "state variable" filters made for modular synthesizers that allow total control over frequency cutoff and peak resonance controls. At the end another DI to get the output impedance corrected, then out to a Mackie power amp to drive a Baer ML112 cab. The DI at the end of the chain can direct the signal to both the Mackie for monitoring and an audio interface for recording into a DAW.
Complex? Naw, not really. No more so than anything else. Expensive? Again, no more than anything else, really. Versatile? Oh yea.
I've been through SVTs, SWRs, TEs, GKs, embarrassing piles of stomps (including the Tech-21 Bass Driver and Para-Driver, their midi-rack setup, the Tri-AC, and Landmark 300), probably every "popular" type of pedal, as well as many unpopular setups. Had the Avalon U5 with an HHB Fat Man tube compressor for a while, had the Ampeg SVP-BSP preamp, digi-stuff (Boss GT6B, Line 6 Bass POD and Bass POD Pro, Amplitube1, 2, and 3).
While it's all good, it's only good until it's not good anymore. Some of that stuff bored me quickly, some of it stuck around a little while. The longest running setup was the U5/FatMan/SVT rig.
This rig I'm using now is so versatile that no matter how my tastes change over time ahead, it can be retuned to suit. I may add other cabs, or change cabs, but the preamp/amp setup is forever. It all fits in an 8u rack. and weighs half what an SVT head weighs.
There is no toy in a box that can replace a 100% modular rig. It's all a compromise.
It only took me 25+ years to get that aspect figured out.
