I have been using the Lip Fusion (not XL version) for a few months now and I really like it. It is an excellent moisturizer. I have a very thin upper lip and I am noticing it does not disappear anymore when I smile, so it must be working

I think it takes time and more than anything it is the level of moisture in my lips causing them to look fuller, but at any rate, it is the best lip gloss/moisturizer I have found. It smells and tastes nice and is not sticky like most glosses. If I want a colour I just add a liner.
Have you tried the other Lip Fusions or is the XL the first one you've tried? I have read that it is even better and am wondering if that is really the case.