I used a 3.78oz tube of Ripping Gel over a period of 5-6 weeks. I bought it online for $50 - don't go to GNC for this, they charge $120!
I definitely got results. After about a week and a half faint lines started appearing if I sat then leaned a bit forward, thus streching out the area. Now the muscle lines are even more defined and are visible when I'm standing up straight.
Two things though:
1. A lot of people say Ripping Gel just gets rid of water retention. This is possible. I ran out of gel two weeks ago though, and it looks the same way as before.
2. Since I started using Ripping Gel, I've focused a lot more on my abs. I've been doing more crunches throughout the day, and spend an extra 5-10 minutes on my abs at the gym. So maybe Ripping Gel didn't do anything for me, and it was all on my own?