SuperPro did a great job in making these available for those who want added adjustments for the rear toe of their WRX or the BRZ. They are made with high quality polyurethane bushings and have nice ball joints.
The only con to these is that you are not able to reuse the emergency brake line that runs to the bottom of the stock toe arms. The solution is the kit comes with zip ties that can snug up the brake lines to the toe arm. The kit also comes with replacement castle nuts and codder pins, however, they do not fit well, and I reused the OEM bolt and clip instead. The kit could come with better install instructions but the most important thing to know is the torque specs. The inside bolt is 67 ft-lbs and the outside tie rod / ball joint nut is 45 ft-lbs. The inside polyurethane bushing also comes with grease. Do not forget to clean the inside of the mount with a scrubbing pad and cleaner to ensure the toe can move up and down easily. I highly recommend buying a ball joint separator like the one shown here. I bent a pickle fork when I did the front end and the separator was the only tool that worked. An alignment is required after installation, I had one way off with the toe at plus 0.26 when it got to the shop. My final alignment aimed for -0.05 in the front and +0.15 in the rear. Good luck!