Disclaimer: I am not an expert on blood stopping powders, nor am I a super-ninja-awesome world's gift to paramedicine. I just sell some of the stuff, and have been an EMT (currently an EMT-B) for about 10 years.
Be advised that the article posted by EMS Rescue Guy is ~5 years old. QuikClot has since been reformulated, and isn't available in a straight granulated form, like seen in use the movie Shooter. QuikClot is now encased in a guaze pouch, making a bean bag sort of product, or it is impregnated onto gauze bandages. TraumaDEX has not been available to consumers for several years. I am not familiar the other hemostatic agents mentioned in the article. Hemostatic agents are still around, and their popularity is still growing, al beit slowly.
Hemostatic agents are not intended to replace current bandaging products or techniques to control severe bleeding. They were created to supplement the wound treatment process, and increase the treatment success ratio. One reason they haven't been readily accepted by the EMS community is because of the varying reports of success, and the exothermic reation caused by the original QuikClot. Many reports of the QuikClot being used in the field stated that patients suffered burns as a result of the exothermic reaction generated as the QuikClot absorbed the moisture from the blood. What hasn't been widely publicized is that in many cases is the QuikClot did help control the bleed, and lives were saved. So, with the choice of inflicting a burn in the area of the wound, or allowing the patient bleed to death, medics have applied the QuikClot because it worked. Also, in many accounts where the products have had little effect in controlling bleeding, the products were not applied properly, i.e, whiping away as much blood as possible from the area prior to applying the hemostatic agent, or not concentrating enough of the powder or granules into the area of the bleed.
In the most recent early days (early 2000s) the major player hemostatic agents were in a powder or granulated form, which also made proper application precarious, especially in a stressful situation. The manufactueres of such products have mostly moved away from the loose powders or granules, and have gone to a more easily applied and managed bean bag-type product or an impregnated gauze.
I work in pre-hospital equipment sales. The hemostatic agents that we currently sell are QuikClot products, SAM Medical CELOX products, and ActCel Hemostatic Gauze. We were one of the exclusive distributors of TraumaDEX products when it was availabe to the consumer market. I have had feedback from customers that have used TraumaDEX in the field, and they say that it did work as advertised. Since we've been selling the reformulated QuikClot products, I have had one customer contact me with positive field feedback regarding the 4x4 Emergency Dressing in a non-life threatening bleed situation.
Of the hemostatic agents we sell, The ActCel Hemostatic gauze is the most popular, with the SAM Medical CELOX in granule form being the second most popular. I have no feedback regarding the use of these products in the field. I do know that we have several repeat customers of the ActCel products. We haven't been carrying the QuikClot products for as long as the other two brands, which may be one reason it isn't selling as well. Also, people may be gunshy regarding the QuikClot, thinking that it still has the exothermic reaction side effect. QuikClot states that their newly reformulated products now have a maximum exothermic reaction temp of 105°.
Finally, these hemostatic agents have not been added to any of our County EMS protocols. However, I carry a few QuikClot products in my personal first aid kits. My attitude is if I personally have a severe bleed situation to deal with, want as many weapons as possible at my disposal to help insure a successful intervention and a positive outcome. Again, hemostatic agents are not stand-alone major bleed fixes. They are a supplement to be used in conjunction with learned techniques and familiar equipment.