i've tried a couple of lip plumpers myself, i was way, way too curious to see what's the deal with these products.. I remember the first I've tried was Lip Fusion.. it was such a nice shade of nude.. but didn't notice any effect.. 0.. pretty colour tho..
and then the Lip Injection, from too faced.. i hope this is the name.. maaaan, get ready for some serious pain! My lips started to itch, burn, tingle like hell.. and they only got red, really red, and the countour of my lips was swollen.. still, the plumping effect on the actual lip wasn't that noticeable.. i still think it was a bit of something, but .. dunno, I didn't like it, don't really see the purpose.. they're only exploating our feminine weaknesses, it's not something we can't live without :)
ohh, by the way. usually I love Bourjois' products, but Pulp Action, their plumper.. aww, it has a lovely iridescent shade of pink.. and makes your lips as red as they get.. nothing spectacular..