I've tried Lip Fusion (original), Lip Venom, and Lip Injection. IMHO, Lip Fusion didn't do any plumping, Lip Venom did a tiny bit, and Lip Injection worked the best but, it wasn't really dramatic. I guess my lips are not really sensitive so I think I may try the Lip Injection Extreme next.
I think the above poster (shawna) is right in that it depends on your level of sensitivity. :0)