My Mojo Suitcase organ has a lid over keys and controls, so I thought a soft bag would do for moderate transport. So far, I was right. It's been hauled in and out of vehicles, up and down stairs, along floors and pavements for the last year and offers surprisingly decent protection. And even if it does show signs of use after a year, everything essential - handles, zippers, padding and trolley - seem to be holding out well.
It's easy to load and unload. The Suitcase has its own built-in handles, which helps further, but occasionally, I have also used it for a MAG C2, when its flight case seemed a bit over the top (as in, when I was a bit lazy). The zippered pockets are large, and fine for anything flat (less so for pedals).
Somewhere in the fine print it says that you shouldn't use the trolley outside. I haven't heeded that entirely, but do keep the weels off very bumpy places. Hard to say how the bag will fare in ten years, but for now I'm very satisfied. Recommended.