often get fills on arca when trade is a winner...if it goes to nyse [and again if it's profitable] it always takes at least 10sec to get a fill. i hate to trade nyse, i am always scare to death of not bein' able to get out, happens at least 60% of the times. i cant figure how prop traders can trade all that size on nyse and not worry about bein' screwed over and over. most times ecns are not an option u know.