Its not a bad idea, if you really want the floor space, and something you can take to practice, a jam session or a gig.
Thing is it is Either / OR The SANSAMP (like the Wine Cellar you tested out, but the real pedal) OR the Tech 21 VT Bass like you have right now. Of course, you can turn it off for clean, but when you engage, you get either or, so best of both worlds, and that is over $400 of pedals to get a SansAmp and VT bass.
It has - Tuner / Octave / chorus / compressor / SansAmp OR the VT Bass It even has a FX loop so if you really wanted to get Reverb, Delay, other compression, etc… But that takes away from it being a single unit, so nice if you can live within it.