At the time, I was doing primarily strangles, rather than verticals. I got reasonably good fills on ES, but horrible ones on ER (if you didn't hit the bid or take the ask, you were just plain out of luck).Quote from jj90:
What type of verticals are you doing FA?
I would then make adjustments to my strangles with verticals and got pretty good fills there.
Generally 1 tick "worse" than midpoint would get me an instant fill, midpoint would take a minute or two.
But, that was last October, but I'd be surprised if it's gotten less liquid since then? What percent between bid/ask are you getting fills?