I like the old ones better, the ones without sugar alcohols. The new Chocolate Peanut Butter one has a grainy taste that I don't like. I'm sticking with the old chocolate bar and peanut butter bar. I hope they don't change those recipes!
I've never heard of Quest Bars, but I'm wary of any bar that claims to be low carb. They often taste too good and I end up craving them, probably because they raised my blood sugar.