The Double-D Extreme Design
Ok, lets talk rigs here. I am about to share with you the "Rocket Science" that is behind the design of these rigs. Seriously, its not rocket science at all, but just common sense. Like many of you, I have been fishing the coast for many years and have seen and used alot of different rigs. There wasn't one out there that I could honestly say was a great rig.
I am going to go through the general design of a basic rig. Then step by step, point out the issues that I see with 90% of the rigs out there. I will then explain how I have resolved these issues, and finally how my design, though simple, makes these rigs easier and more productive to fish with. After reading this you will be able to see what makes a rig an "Extreme" rig.
Your Basic Rig
First of all, what does a basic rig consist of? Most of the rigs out there are a single strand of mono, flourocarbon or cable with parts (swivels, crimp sleeves, hooks, beads) attached in some fashion or another. They are designed to be fished with 4 -10oz weights (spider, bank, pyramid, etc..) and chunk cut bait or whole fish. Most are fished with a 10 -15' med-heavy or heavy action rod with a 3/0 to 5/0 reel, and 25 - 50lb test mono or braid. They are thrown as far as one can cast, usually toward deeper water.
Rig Issues
We'll start with the use of mono or cable. A single strand of mono or cable while economical, presents a problem. 
Mono Only
If only mono is used, usually for less visibility, and you hook a shark, blue, kingfish or other "toothy" critter, then it can be bitten through and you lose your fish.
Cable Only
Cable on the other hand, while strong and durable, has it's problem too. About 2/3 of the way down a typical rig there is a crimp sleeve, usually with a bead(s) above it and above that is a snap swivel. Your weight of choice attaches to the snap swivel. After casting this rig several times you will notice that where the swivel hangs on the cable, it will begin to produce a kink (a sharp bend in the cable). This kink weakens the cable and eventually it will break.
Swivels
While swivels are an integral part of the rig, all are not created equal. Quality will vary among manufacturers. The main issue with swivels is color. Most rigs have the nickel plated or bright brass colored swivels. In some situations, gamefish will tend to go after shiny objects. When this happens, the fish will focus on the rig and not the bait.
Crimp SleevesCrimp sleeves are probably the most important part of any rig. They are integral to the functionality of the rig because they bind all the components together. They also are usually the point of least focus when looking at a rig. There are a couple of issues with most sleeves. Like swivels, color is important when using crimp sleeves. The aluminum and nickel plated sleeves can be the focal point of a gamefish bite, just like a swivel can.
Crimping a sleeve is what can make or break a rig. Of the crimps out there, I will only say this, on most, there is definitely room for improvement. Without a doubt, the biggest issue in dealing with crimp sleeves is the ability of one to distinguish between a great crimp and one that is to say..... "questionable??".
Castability
There is a final but important area that most of the rigs out there fall short, literally. When casting a rig with say 8oz of weight and 6-8oz of bait (8 and bait) as it hangs, the weight and bait will rotate around each other in flight. This is referred to as helicoptering and will greatly shorten the cast distance.
When using a spider weight, the loop at the hook (not the hook eye) is hung on one "leg" of the spider weight. This creates in effect a single point of weight during the cast and no helicoptering occurs. However, on most rigs the loop at the hook is too small. This causes the hook loop to remain attached to the spider "leg" after it hits the water. Then the current will usually tangle up the excess leader around the spider legs which is not what you want.
The Extreme Rig 
Now that the issues have been defined, here are the solutions that are reflected in every rig I build.
We'll start with the dual material design. It combines the flexibility and kink resistance of mono and the strength and durability of cable. The snap swivel will not kink the heavy mono and a "toothy" crittter is unable to bite through the cable. Typically, visibility is very low in the areas that these rigs are fished in, so the use of cable doesn't affect the bite.
Next, the use of black, Rosco swivels and crimp sleeves keep the gamefish's focus where it should be......On the bait.
125lb and 400lb black crimp sleeves are used which have proven to be more than sufficient in the rig applications.
There is a proprietary method used to crimp these sleeves, which produces a low profile, uniform and clean-looking crimp. It also utilizes 100% of the crimp sleeve's area to achieve maximum strength.
And finally, a large loop at the hook is found on every rig. This eliminates the hook loop from staying attached to the weight leg.
I use a berkley knot to attach the rig to my line and then its Game On!!!
Like I said before, the rig is simple and easily fished. Its great because it will ultimately give you the edge and help you land that fish of a lifetime.
TIGHT lines and BIG fish!!!!