I really like the design and size of this pen, and it really will write on just about anything, but the ink glops. If I paused while taking notes, the first stroke of the next word I wrote began with an ink blob. When I used the pen the first thing in the morning, the first stroke had a big blob.

I loaded the blue refill that I purchased with the pen to see if the problem was the black refill shipped with the pen. It didn't seem to produce as many blobs, but it wasn't a clean line like my Fischer space pen cartridges.

Too bad. I really like the concept of the pen and really like the design, but I can't take the smudges.

I'm trying really hard to love this pen, but after almost a year owning this pen, I would not recommend this.

Good
1. Smooth Ink (Not as smooth as Uniball Jetstream), but better than most
2. Clear and solid Black color
3. Pretty look, (I have one in White)
4. Great spring loaded clip

Bad
1. Major flaw on this pen, if you like to click pen unconciously, the ink will leak all the time.
(The pen is designed to pressurized the ink with air everytime you click on the pen)

I got ink smeared over my bag pack and my hand.

If you need a pressurized pen that can write well on any angle, you should skip this one and go with the Powertank.

This pen is an absolute homerun. I've owned two so far since I've lost one and I've loved every part of it. The clear body lets you see the ingenious pump mechanism which allows for the refills to be cheaper than other pens whose pressure comes from the cartridge. The clip is beefy and durable, which combined with it's stoutness makes it perfect for an everyday carry pen.
As for the complaint that pumping it too much will make it spew ink; I've tried to have it happen but couldn't with both pens I've owned.
The only flaw I could point out is that the top button and bottom tip are silver painted plastic. The paint will wear off in spots after about a month or two of keeping it inside of a jean pocket.

This is my everyday carry pen.
Short length fits into jeans pocket easily, and the ink really does flow nicely in all kinds of situations.

I love this pen in writing performance, design, and versatility. The only problem is that because it will write anywhere ... and it will ... I will take it anywhere. I've had two of them, and it's the only model pen I've lost in the five years that I discovered implements beyond Bic. It's too damn excellent for its own good.