In general I can't complain too much when I am getting stuff for free.
My biggest complaint about Rapidgator, Filejoker, FileFox are the one file limit per hour/multiple hours
Speed for free downloads generally sucks, but again, it's free
The countdowns are annoying but I can live with that
I just wish they would remove the limits on the number of free downloads.
I have K2S pro premium and absolutely no complaints about that