Chris' look good, Brad either has implants and poor ones at that or did a Very bad job of following the proper Syntherol protocol and pumped way too much into his bis and didn't even get into the muscle remotely deep enough.
I have used Synthetek's Syntherol on my bis and tris and had excellent results. I know many other Pros that do and have used it and had the same great results. If you follow the proper protocol, you will see great gains and keep the muscle group looking natural!