I have had no problems- yet. Interestingly, my RO referred me to another Urology practice for placement of a balloon and fiducial markers. The referral specified placement of SpaceOAR. However, while I was undergoing the procedures, a nurse (or medical tech) gave my daughter, who had driven me to the appointment, a card with information on Barrigel. I had already finished my nine weeks of radiation therapy when my daughter came across the card and gave it to me. I have inquired of the MO to determine which spacer was used in my case. The office of the MO has not responded to this time. Also my RO added a step in my procedure. After placing the absorbable gel barrier, be it SpaceOar or Barrigel he directly inserted an inflatable balloon prior to each treatment.Unlike the BioProtect approach with a gel filled absorbable balloon left in place for the duration of the radiation treatments, this one was inserted prior to each radiation, treatment. The deflated balloon was inserted, then positioned and inflated with a saline solution. After the radiation, the balloon was removed. This was done for each radiation session.