Concentrates are used in some commercial wines, but personally, I choose to buy wines only from designated regions and produced according to the local appellation controls (DOC, AOC, VQA, etc.) all of which prohibit the use of concentrates as far as I am aware... call me a snob if you will, but I like the wine to be an expression of region and vintage. By all means, use a kit to start out and maybe you'll even get lucky and find a kit that suits your own tastes. Any and all experience is beneficial as you start out... it is all a learning experience and kits definitely allow you to minimize your investment while maximizing your learning curve. Just wanted to throw my own two cents in as to the difference between concentrates and juice as I see it.