Needed a good pen for my Army uniform. It fits inside the the pen pockets of the new Army ACU uniform. The barrel is smooth, thin and there's no rubber grip that gets in the way. The size also makes it a great pen for a checkbook or organizer notebook.
The pen is small, but stainless steel, so it's got a bit of heft to it for its size. It feels like quality.
The spring is strong, but the clicking mechanism is smoothed. Maybe there's a buffer or something so it's easier to click than the spring makes it feel. The button is rounded so it feels good on the thumb.
I'm mostly disappointed by the lack of places that sell this pen. Office supply stores used to sell them, but not anymore. Cheaper plastic pens with rubbery grips, there. Most places sell the Zebra pens, but those are made in Indonesia, where the Parker is made in the UK. I feel better about supporting a British company. Also, as someone else noted, you can't just buy a Jotter with blue ink. You have to order that refill separately.