Unfortunately, all of the implants carry a <1%/year rate of rupture.  No one has an answer to the rupture question so it's a toss up as to if yours will rupture or not.  Typically women who undergo breast augmentation will need another surgery within there lifetime.  This may be to elevate the breasts due to sagging at which time the implants should be changed out.  

The benefit of silicone filled implants is that if the implants rupture the silicone will be trapped by the capsule that forms around the implants.  The rupture is then usually only detected by mammogram.