I imagine that 99% of people on this forum don't know anything about them.
I consider Advintage to be one of the lower brands, although I have very little experience with their products. In 2003, I received a Moments Frascati from Advintage. As I recall, it was a decent white wine, but I wasn't familiar with Frascati to provide a true comparison. I thought I made some notes on their instructions and process, but it's almost 10 years later and I didn't find them in a quick search.
BTW, perhaps my biggest dislike of Advintage was the negative (at least that's how I perceived it) advertising they sent out. Note, I ran an LHBS at the time.
Steve