Shot one of those this past weekend too. It was an odd arrangement, but fun to shoot on close in targets. The FN really, really needed a different place to put your off hand.
Since it was my FS-2000 Middle Man was shooting I thought I had to pop in on this thread and say hi...
As to the jam comment... The FS-2000 has a "inspection port" on top of the reciever that gives you some access to the chamber (under a closed hatch). Not sure if the Keltech has the same system if not it should. I had one double feed in the FS-2000 from a bad mag, which due to the inspection port was no harder to clear than the same problem from my AR...
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As to the FS200 ,Yes it is strange, yes it needs a vert foregrip or something to give your weak hand a good place to be, and the sights suck... With a C-more mounted, however, it is wickedly fast on close targets due to there being almost no weight out at the end of the rifle.
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Peter