I've never really understood why Andras didn't go for a more compact housing. He said to me that not many bass players had made this comment to him, so he didn't see it as a priority. But it seems an obvious thing to do, given many bass players' desire to maximise the use of their PB real estate (and the considerable demand for @GisserD's more compact housing).
However, the work that @Quatschmacher and the FI team have put in over the last couple of years on the software has been superb! The original interface was a PITA and very off putting - but it has been transformed out of recognition and the same can be said about the manual and I'm seriously tempted to give the FI another go.
A smaller form factor and updated chipset (I think the FI came out in Dec 2015 Future Impact - YouTube ) - ideally with a better on-pedal UI / display , would make it a complete no-brainer.