We now interrupt this FC7 lovefest for an alternative perspective...
There's five families of pedals that your S2EX supports, and the FC7 is just one of them. Myself, I cut my synth teeth on a Kurzweil, which meant learning on a Fatar (OEM) expression pedal, which is still sold. But it's not the most durable, and a little too lightweight to consistently stay put.
I've been through a bunch of other pedals over the years, searching for the right "balance" between sensitivity, adjustability, throw, and bulk/weight. And durability.
I had an occasion to use an FC7 live once, with a Yamaha (Motif family). I hated it at the time: too bulky, and the throw was uncomfortably extreme. But that was just me. If you learned swell/expression on a Hammond B3 or a Yamaha, this is in your comfort zone.
I splurged on a Mission Engineering expression pedal a few years back - red enamel to match my Nord! Probably the most solidly built of them all, but the throw was just too short for my taste, it was hard to use subtly. It's been relegated to (a very expensive) secondary backup.
The Boss FV-500L is not quite as bulky as the Yammy, not quite as long a throw (but longer than most), made of aluminum. and is a multitasker - it has a pair of audio ins and outs, in addition to the expression function. I still like it a lot, and is my primary backup.
The one I cart around most often now is the Boss EV-30...a
dual expression model. It takes up less room in my backpack than any of the others (even the Fatar), but I like its feel, and it stays put nicely.
(If I'd heard of the Moog before, I would have definitely checked it out.)