I just finished off one of these kits, Peach Chardonnay. It tastes good, but instead of a nice alcoholic buzz, you get this weird listless, groggy feeling when drinking it. I tried it out on some friends the other night and they expressed the same thing. I don't think I'll bother with another of these kits, you pay almost the same as a regular white wine kit, get half the alcohol, and it's a bit too sweet for my taste (not to mention the "I just got clubbed over the head feeling" after drinking it).
I suspect you could do better by just making a good white wine and mixing it with something if you happened to want a bit of a wine cooler type of effect.
Ian