I love a good hamburger.  I  don't need anything super fancy--just a good burger, and I'm not that picky.  I was trying to figure out what I was in the mood to eat Friday night, no food in the house, and ALMOST walked down to Mr. K's when I realized I had never tried Zack's and someone here had given it a good review.   I love an old-school burger joint (old fashioned AND cheap) and this lived up to my expectations.  Everything was small, and I say that in a positive way.  The drinks weren't 50 ounces, the fries weren't in a bag the size of my head--everything was reasonable sized and reasonably priced.  I got a coke, a small fries, and a burger, and it was all tasty, hot, and delicious and inexpensive.  I'd definitely go back, and I'd say I prefer it to Mr. K's because Mr. K chargrills their burgers (I think) and I don't love the taste of char.  But still, either one satisfies my burger craving and I love giving them my money vs. 5 Guys or Wendy's or whatever major chain is around my neighborhood.