Since uni-ball engineers designed the first metal tipped rollerball in 1979 they have continued to produce high quality writing instruments to meet all requirements.
I usually opt for a retractable pen, as much for the clickability factor as convenience, but the Uni-ball Signo UM120 Gel Ink Pen is awaiting a review so I'll see how it fares.
This stick pen contains uni's renowned Super Ink, well known for its resistance to water, fading & chemicals making it tamper proof so not a popular choice with fraudsters. I found this smooth ink to be quick drying with not a smudge in sight unlike some gels, neither did it bleed through the page.
The Signo UM120 is available in 8 different colours including a vivid orange, pink & this light blue one I'm putting through its paces. The caps & end stoppers are colour coded with the ink & although the transparent barrel on mine seems to reveal a darker blue the end cap proves an accurate guide.
Having noted the 0.7 displayed on the cap I expected a medium tip to write a wider line, but wasn't at all disappointed by the writing experience. This Signo was very light & fairly comfortable to hold even though it doesn't have my preferred rubber grip. The slight step between the silver nose & raised area on the top section of the barrel did prevent my fingers slipping, having said that I'm not sure how long it would be before I tired being conscious that I needed to exert more pressure than I would with a more defined grip.