For some injuries to the knee, leg extensions can be the worst thing.
Agreed, lot of stress on the knees with these.
Address 2 more points concerning this thread:
To answer your queston on the cost of supplies "Supreme" looks OK to me. Yeah, you can find cheaper, but you can find a hell of a lot more expensive too. If you know your source is legit, and has quality products I don't see a problem with the price.
As far as your knee injury goes, I'm not going to question the validity of your quick miraculous healing, only you know the truth and real story... whether your telling the truth or if you are full of shit, I could care less. Not trying to sound cold, I wouldn't wish injury on anyone, but it doesn't really matter here. The only thing that matters is if you are completely healthy or not, and only you know that. If your not then don't do the cycle, no matter how bad you want to. Wait until you are at 100% so you can train hard and properly, and take full advantage of the cycle as well as the money you spent.