Im with Bob,we checked all the hans type systems and chose the R-3 for a few reasons,the first and most important to me is that the device straps to you and your helmet instead of your seat belts like others,this means when your seat belts are undone,the R-3 is like a very small backpack that comes out with you.I talked to others that had run the Hans device and they said that in the event of a crash they had problems getting the Hans from under the seat belts to get out of the car,with the R-3 I can get in and out of the car without even knowing its there. The other reason ,and its a good one in my mind,is that almost every Top fuel team,Nascar,off road team,etc, choose the R-3 over the Hans.Its like everything,theHans was first and the R-3 was just improved in the areas that needed improved on.
Just my opinion,Phil.