I have tried the Quest Protein Bars and they are AMAZING. They taste better than most of the protein bars I've eaten and they're the only ones I've found that don't have an aftertaste.
I always try to eat whole foods when possible but protein bars are super convenient.
I had pretty much given up on protein bars because they are ALL full of sugar or sugar alcohols, glycerin, brown rice syrups, etc.
Quest bars are the first I've seen that are different and I find it interesting that they display their ingredient list right at the top of their homepage because they know that they have managed to do something really different:
Quest low carb protein bar
They're only available online so I usually place a large order and get free shipping. They're only $1.99 each.
I think you'll really like them.