I tested it and timed it.
butcher combo does as much as cyclone combo (version of upheval)
and butcher combo takes 2 sec while cyclone combo takes 3 sec.
Why doesn't funcom fix the cyclone version so that it takes 2 sec too?
only good thing about cyclone version is that when you get reaver stacks you get 15% crit rating (IF YOU GET STACKS), still 15% isn't 50%.
Lastly 3 sec is long enough for a sin to kill me with sins of the flesh if it crits (which is even shorter) to put into comparison)