Have you tried one? I ask because I had one and see the point . . . YMMV.
I haven't had the chance to try one yet, no. But I haven't heard a bad video on youtube, or read a bad review of one yet either.
The pedalboard I have is a cover-all-bases-with-minimum-effort affair.
The top row (Glowplug + WTDI) is always-on, fingerstyle. Glowplug is set very clean, very gentle, just to stop the WTDI sounding too sterile. Amp EQ is set for slap, and is switchable in/out.
Bottom row is in the FX loop, and the full arrangement is:
T-Rex Quint
EHX Bass Soul Food (not purchased yet)
Boss AW-3 (which is still at my parents house, despite having moved out over a decade ago!-must pick that one up.)
Boss CEB-3
So the Quint and the Chorus are there for ballad-type stuff, the AW-3 is there to funk things up, all that's missing is some huge-sounding drive. Bass Big Muff is the daddy, but I'd only have room for the Nano, and I've heard that you reeeaaaally need the deluxe because of the blend knob. Apparently the Nano sucks out a lot of the low end from your signal.
Soul Food is a Klon clone, sounds great, is in the nano/compact format, and has a blend. Done.