I like the feel, style, and function of these pens, and use them daily. Unfortunately, they have one design flaw; The plastic "bump" where the wire clip anchors itself to the pen body has broken in the same place on 3 different pens. It appears that the two small insert holes are a weak point which eventually fracture/break from repetitive use. I don't clip these pens to anything other than my shirt pocket, but apparently, even this slight stress is too much for this pen to handle. Each pen has lasted about 4-5 months before the plastic snaps. I have 3 broken, clipless Tombows rolling around in my desk drawer now and one "Clip attached" Tombow Airpress left in my arsenal. Regrettably I won't be buying anymore unless the flaw is corrected or the price is lowered.

I wouldn't recommend this pen for lefties, smears hand when writing as the ink isn't quick dry. I find the pumping mechanism inconsistent and occasionally I get splodges of ink. If you are after a pressurised ink pen to write on any angle with the added bonus of quick dry ink I highly recommend Uni-Ball Power Tank pens.

Good while it lasted. Not sure if it's just a manufacturing issue, but what happened on mine is the black plastic tip just came off one day.

Love this pen, compact but powerful and great design

My third one. I plan to give others as gifts. These pens are perfection. The action is smooth and satisfying. The ink flows smoothly. And the shape and texture are pleasing in the hand. Not to mention they can write overhead, which doesn’t mean much to me but some people must do it. Grab some!

I love how you can make a gradient. Makes it good for sketches

Gave as stocking stuffers at Christmas. The family really seems to enjoy them!

The good:
Awesome pen! It's compact enough to carry around in my pocket at all times without being in the way or cumbersome in any fashion. Ergonomically it's surprisingly comfortable to write with for extended periods of time and between its weight and diameter it's actually easier to write with in inclement weather when your hands might be too cold to maintain fine dexterity.
THE BAD:
My only gripe with this pen, understand this may have been a one off fluke, the ballpoint that came inside the pen I received was unbelievably crunchy to write with and I only managed a total of 20 feet worth of line writing with it before it became unusable to the point it wouldn't flow ink in any capacity. Compressing the ink, scribbling, lightly heating the tip (hair dryer not open flame) did nothing salvage it.
Changing it out with a standard refill and the pen is superb, however, being basically dead on arrival forces me to give it 4 stars.

Smooth writer with consistent performance. Does very well on airplanes.

This was my try it out pen. I like it but feel like it's to short. I'll keep working at it.