I have ran Firestone 224c (2600), Slam Re-7's, Slam SS-7's, Dominator 2600's, Dominator 2500's and Firestone F9000's in my years of Driving Bagged Vehicles.
This is my review
Firestone 224c are good bags and its nice that they have stud mounts on top. they lack the lift of other 2600lb bags
Slam RE-7's are nice bags but they are very bouncy. they require over 3.5x the force to collapse completely than Dominator 2600 bags. its nice that they are non ballooning.
Slam SS-7's are good designs, but they sucked from day one. leaked terribly and were way too soft. they require only 50 psi to collapse. which is 6x less than the RE-7. They made the sidewall thicker and reduced weight which leads me to believe the wire mesh inside is thinner or the same thickness because I doubt the composite plate are so much lighter than the aluminum plates. I don't know that for sure, I just know they sucked.
Dominator 2600's are my bag of choice for the front of Fullsize trucks and Bag on Bar rear setups. gives a nice smooth "wavy" ride before shocks, which is much easier to dampen. the lift is there and you don't have to worry about overloading the bag seeing as its rated for a max pressure of 600psi.
Dominator 2500's are my bag of choice for rear cantilever setups and minitrucks. act just as the Dominator 2600 but for lighter load applications.
Firestone F9000's are my bag of choice for the rear of fullsize trucks when the bag is directly on the axle. As long as towing and lift are not needed to be huge. I run these on my personal truck and they are awesome. Best ride I've ever had in the rear. also the bag of choice for RideTech rear Airbar Kit.
Those are my reviews for what I have personally ran.