@RayfromTX had one installed in his wetsuit, and was pretty happy with it, see his posts in this thread. Had the work done by Terrapin Wet Suits, which is near San Antonio. I intended to do the same but never got around to it. Whenever travel to warm water is possible, I'll probably send it off to have the work done.
+1 for Chris at Terrapin Wetsuits. She has done a lot of work for me and can highly recommend her. I believe she installs the relief zipper laterally which apparently reduces the strain on the zipper.