I usually just get the GG&G as well. All the hard work is done and the pad is designed better than the TTI one. FFT also has one, but it is substantially more expensive than the GG&G. The FFT pad is a little nicer cosmetically.
I know that many have used the GG&G version. They include a modified factory latch and have a nice button ready to assemble. No drilling or tapping needed. I have one and it works well.
https://www.gggaz.com/benelli-m4-tactical-bolt-release-pad.html