Nice handy little dispenser. The price is a bit iffy considering you can buy these for a quid from anywhere that sells genuine Zippos. Still it's always nice to pay a little extra to avoid having to go out and find somewhere that stocks these.
Point of note for the collector of Zippos, do not leave flints inside Zippos that you are not currently using. Somewhere between 5-10 years the flint turns to dust and can be quite messy, leaving you to clean up your Zippo collection.
I go through a flint every 4 weeks or so with normal use. Although I roll my own smokes which tend to go out quite quickly and need lit again so I suppose I use the flint more than someone smoking regular cigarettes.
I once finished a flint in a single day just through practicing Zippo tricks all day long so it really depends on what you're doing with your Zippo.