i was on estrostep 4 years ago, but only for 9 cycles. the first month i was moody, but i never had breakthrough bleeding with it.
sometimes right before my period on the highest-dose step, i would get a little light headed.
my periods always started on the same day (tuesday) and were always predictable

though they were never "light". but they werent heavy either. very average.
In the 9th cycle i started getting panic attacks for no apparent reason (though i was in college, it could have just been stress? although things seemed fine). So i stopped mid-cycle, and i felt better after that.
but other than that, i thought it was great. i only relied on the pill at that time for birth control, and it was fine, i never had a scare or anything.