Bulky flashlights are boring, and hard to get to, because they are often carried in a bag. The Quark mini can be carried on a key chain, which makes it super handy.
This one has been in my wish-list for a while. No more reaching into the bag for the flashlight when parking my bike in the unlit garage.
edit: It looks like I don’t have to worry about replacing the CR2 batteries. This is because the purchase puts me in a Batteries4Life program, which replaces my CR2 battery every six months for the next 10 years. Sweet.