Firstly, the "fire-wire" is what sets this file apart from all other files that I have tried (and I've used a lot of systems in my 20+ years of practice). What this accomplishes is controlled memory in the file as well as strength. This means that you can pre-bend the file before placing it in the canal. This is exremely helpful in posterior teeth when the patient has limited opening. It also follows even the most extreme curves, as seen in some of the posted cases, without wanting to straighten out, thus minimizing tranportation of the apex. In addition, it is also the most resistant to breakage that I have have seen. The price point is an added bonus! I am a huge fan.