No, I did not.

When originally discussing with the urologist at the time of diagnosis, he suggested I get that if I was doing radiation for the primary / initial treatment. I went with surgery.

When the PSA started to rise, I went to radiation oncologist for salvage radiation treatments (39) and he (the radiation oncologist) didn't recommend it for that treatment.

Sorry for the length bettwils16 regarding spaceoar. I called them and they spoke with me and sent me the following. Its all on the spaceoar.com website.

How the SpaceOAR Procedure is Performed VIDEO

The website which serves as a patient education center, There you will find articles covering several different topics such as understanding staging and treatment options, information on diet and nutrition as well as discussion guides.
SpaceOAR Hydrogel- How Does It Work
Educational Patient Video
Patient Education Resources and Articles

Advocacy Groups on our SpaceOAR.com site: SpaceOAR: Patient Advocacy & Support
ZEROCancer: Quality of Life
ZERO: Diet and Nutrition
zerocancer.org-Prostate Cancer Treatment and Side Effects
Cancer.gov/prostate Cancer treatments

On the web site are a couple of clinical studies:

Bowel dysfunction: Compared to the control group, 66% of patients were able to avoid clinically significant declines in bowel function
Urinary dysfunction: Compared to the control group, 66% of patients were able to avoid clinically significant declines in urinary function.
Sexual dysfunction: 67% of patients who received SpaceOAR hydrogel maintained baseline erectile function compared to 38% of men in the control group who did not receive SpaceOAR.
Studies:
SpaceOAR US Pivotal Study – 15 Month Results
Three Year Follow-up of SpaceOAR Hydrogel Pivotal Study Patients

Sexual Quality of Life Study After Radiation Treatment with SpaceOAR

I had a failed placement of the SpaceOar gel. Now waiting until gel dissipates before I start radiation treatment without the SpaceOar Gel.