Come here quite frequently, but every time I feel guilty because I was a huge supporter of Cookiez on Mill and was very sad when it closed.
Cookie sandwiches are great, have tried lots of combos. The milkshake isn't their speciality, I wouldn't recommend that.
I have a problem with the fact that they wait to see what kind of payment you pull out of your purse/wallet and then decide what to charge you. If you pay with a card it's 2.35, but if you pay cash it's 2.00. I know they're covering their vendor expenses, but they do it very sneakily and it's not like they post a sign (most stores who do this actually display it) to encourage you to pay for cash.
I also didn't like that when I saw them as a vendor at a local event they charged $4 for their product. I know business and the whole "supply and demand" thing, but being a regular customer it rubbed me the wrong way.