I go here very often because I have a small engine shop and I always just need a specific nut or bolt or something or another, and they always have more supplies available than other hardware stores like Lowe's or Homr Depot. The employees are always great, and knowledgeable. Even if the store is out of stock of something or they don't sell it because it's uncommon, the employees can always point you in a good place to look for it.
The coupons and rewards system are both great tools once you figure them out, I've saved hundreds of dollars over the years.
They sell nice, name brand tools, but if just want something to do the job, a tool store like Harbor Freight has them beat. (They are after all a tool store and not a hardware store)
One thing I wish they had more of was locking flange nuts. They don't sell any of any kind, and I always seem to need them.