Steeda may not have as big of a drop but one thing they are good at is making it handle on the street without destroying ride quality.
I've had Eibach sportlines, Eibach drag launch, H&R super Sports, and Steeda Sports on my past and current mustangs and the Steeda Sports were by far my favorites and are still on my 2009 GT. I'll wait to see what they offer as I would like it to sit a bit lower but don't want to upset the balance that Ford Racing has built into this vehicle. That is why my SVT focus got all new ford racing replacement suspension parts rather than going aftermarket as I saw no need to change the handling, other than better tires.
I had a set of ground force springs on my 05 explorer Limited (2 1/2" drop) and the ride was straight-up rough. No one made a shock or strut that could handle the spring rate for that chassis so that didn't help. But generally, the lower my vehicle got from the factory with lowering springs, the worse it got.