I also own Foldermatch but has effectively switched over to Beyond Compare.
Beyond Compare is actively developed but Foldermatch has been at a standstill for a long time.
But to be fair, it does detail its revision historyhttp://www.foldermatch.com/fmhistory.htm
Besides, Beyond Compare is a much better product allowing you for example to easily see within the sub-folders (by expanding the folders) which Foldermatch does not. And that in itself is a very important feature as it is a tremendous time saver.