If any lefties are reading this, (left handed of course) the Ithica is a bottom ejector.
I just found this out last weekend while looking around at the prospects of ordering a left handed 870. I will say, after handling one in the gun store that the action release is a little cumbersome to use with the left pointy finger. Overall, though, I found it to be a nice gun in the hands, and very light.
I still may go with the 870, but I thought I'd pass this along.