JFry. .
I have the Mitchell EEP Dual Disc in my truck and its been in there for almost 2 years and has performed flawlessly. I also have a couple of good friends who use the SBC double and they too have been flawless. I will give you my opinion on both and you may take out of it what you wish...
The EEP Version which I have. .
When I made my decision to go with this unit there was only a couple of doubles available as SBC was just getting theirs ready for production. My 2nd Centerforce had went south the week of the big Mopar show at carlisle and I needed my ride. I called Doug at EEP and scheduled my appt and arrived the night before. When they got to my truck the next day the job was done very efficent and quickly by Ryan one of their mechanics. He paid particular attention to trying to keep my ride as clean as psooible as I had it all detailed for my upcoming show. Truck was done in a very short time and I was off back to PA.
The clutch will hook and handle anything I have asked it to do. I will be honest and tell you I do not pull or go off road with it as my truck is allergic to dirt and mud,LOL. It has done what I wanted it to do on the street and when I need to drop on the hammer it has never left me down,it flat hooks and hauls. It is a quality unit installed by a quality shop.
The SBC Double. .
The one I drove was one of the smoothest driving doubles I have found. The engagement makes shifting easy and has done what it has been asked to do. I really liked the way it drove on the street. A little less rattle than my EEP version which some owners like but has the same engagement. This is also a quality unit made by a quality shop who has a customer service record thats second to no one.
The reasons I choose the EEP over the SBC were simple. The EEP was available and at the time the SBC wasn't. I had watched what Sled Puller had done to his truck for a couple of years,both on the street and pulling, and knew he had broken every other driveline part,but the EEP clutch,It had never failed on him. This was the other reason and if I had that choice now,it would be a very tough decision as both are great units.
Remember this,any double you purchase will require the upgrade to the bigger input shaft and it means more money. With any double you loose a little drivability to allow for clamping force. While they may not be the most "street friendly" units to use they are worth their weight by providing the confidence that when you need them they will perform. The one main difference between the two is the rattle. The EEP versions rattle is much more pronounced,while the SBC is still there but not as noticable. I have had people ask me what was wrong with my truck and love the looks the nacho wagon(you know them,the cars with the oversized sewer pipe mufflers) owners give me.
Hope this helps some and if you have any other questions feel free to drop me a PM... ... . Andy
Attention: TDR Forum Junkies 
:--) That's a great way to start posting on TDR..... asking which DD to buy to drive everyday and sled pull! :-laf
I just don't use enough RPM and it gives me a little shutter at times. If I bring the RPM's up and let it out it's fine. I'm suposed to call Peter and talk with him about it and see what we can do to help it some, cause it does get a little shakey while pulling a large load and shift on inclines. Other than that one thing I love it strong as heck and able to rip Spider Gears out in a single hook. 
:-laf ) Peter's new redesigned pressure plate took probably 1/2 of the pedal effort out of it, but its still stiffer than a stocker or single disk aftermarket. 
