I've tried a few modelling solutions for guitar and bass, and it's so different now than just a few years ago. It seems each one, though, has a speciality. I have not been lucky enough to try the real high end stuff like Fractal and Kemper. When I get a bass I like the sound of, it seems that more processing occurs, the worse it sounds. I've used various software amps, Eleven Rack (had a good SVT on it), Helix, Pod HD 600, Fender Mustang floorboard, Boss GT 6B, Helix Native plugin, Zoom Multistomp, Logic and GarageBand amps, Sansamp VT Bass rack, Sansamp Blonde. And now I'm using Tech 21 VT Bass DI with Boss GT-1000 Core. Every one of those products has had at least one killer sound in it, but at the moment I feel like the VT/Core combo is the best I've had. HA...sorry for the long list. EDIT if I had to go back and use one of the older ones, it'd be the VT rack, which isn't a multi fx of course.