I am a big fan of the Uni-ball Eye pen. It's a pen I have used for years and has always served me well.
The Uni-ball Eye Needlepoint is a rollerball pen with a waterproof pigment ink. (The needlepoint part in my opinion is questionable.) You can pick up one of these pens for £2.56 making it a very reasonably priced pen.
The ink flow on the Eye is consistent all the time. Because of the pigment ink you get this dark smooth line on the page which looks great. I use this pen a lot for brainstorms and mindmaps, for addressing envelopes and annotating documents because the clarity and definition of the line is so good. I think you get a sense of that from the hand written review shown below.
Downsides of this pen are definately the design. It's not the most attractive looking pen I've ever seen, it's actually pretty ugly. The pen is completely made of plastic and is a combination of a white pearlised effect with some questionable patterned barrel design, that also displays the barcode!
This pen is solid, and not in the Karas Kustoms type of solid. I mean that every part of the Uni-ball Eye is fixed. This pen does not work as a refill like the Pilot Hi-Tec-C so there is no way of doing a pen hack and making it better. It's a shame that Uni-ball havent adjusted the pen to allow for this or offered a premium version as I think they'd have a lot more success with this pen.
Colour options are where the Uni-ball Eye lets itself down even more. If you're buying single pens you get the standard red, blue, black and green. If you buy a multipack there are a slightly broader range of colours, but you have to buy the whole multipack. Another D'oh for Uni-ball.
What I'm trying to say in this review is I actually really like this pen but it could be so much better. In a market where you're competing with the likes of the Pilot Juice, colour choice is a big selling point. I can only assume there is not the market for these extras or a premium version of this pen which is a real shame. I would recommend grabbing a few of the Uni-ball Eyes and dotting them around the office or house as they are handy and reliable go to pens.