The one I don't really see much difference in using is the Instant Lash; maybe that's because I don't really have that good of a base to work with, who knows. I do like using this for making my eyebrows look fuller and tamed though, and it does work as a good primer for mascara, which I guess in turn elongates lashes. I wouldn't say they were fuller though.
Excuse the awful face and terrible lighting, but below you can see a before (left) and after (right) shot of all three products in use. I think my lips look slightly fuller, but the most noticeable is my eyes. Would you agree? Products are priced at £25 each and can be purchased online at MyShowcase.