I have not tried Deltas but I think I have the rest of them. TwinBoom has a nice set up. It's loud and has some new stuff added. My favorite might be Mitsu's and the most realistic, engine wise..and other, is probably Rangers.
The great thing about member made sound packs is that people take the time to make them FOR US and you can mix and match any sound your not happy with.
The one in my sig is a compilation of my favorite sounds found or made.
I greatly appreciate all the work that has gone into complete sound packs as I've found it very difficult and time consuming to make them.
There are quite a few in my link that are brand new to AH. I have been messing with some engine on and off timings lately only to have made a few. Timing them to the smoke and getting the right sound I want to hear is hard to do. They are not in the add on pack tho.
To all the players who contribute in any way to making the game more fun or enjoyable, A big Salute and you have my gratitude!