I had my standard Swiss Flarm software updated (free) as required in
2008, in common with every other then user that wanted to continue its
functionality. There were no bugs to eliminate as far as I know. I
could tell no difference between before and after.

I do not expect any other differences to be apparent after the next
update, but it is possible that they will have made improvements to
such things as algorithms, which may work better, but probably not in
a way that is readily apparent.

I suspect that there may be other reasons why they have periodic
software updates, to do with possibly obviating reverse engineering,
or other commercial reasons. I have no inside knowledge, but I
certainly have not had any reasons to suspect bugs at any time.

I think your fears are misplaced, though understandable from somebody
who is not yet a satisfied user. (I am.)

Chris N