I used my new Papermate InkJoy Quatro 1.0 pen a lot during this week. Multi pens are very convenient. I find the 1.0 to be a bit broader than my ideal but it writes smoothly and easily. I grabbed this bad boy for just shy of two dollars at Walmart.
Do you prefer multi pens or carrying multiple pens?
Miscellaneous Ramblings of a Thirty-Something DIYer 
bill
Love multi color pens. I have used the Bic one for years. I never see anyone else using one but they are always for sale at the supermarket and they are made in France.
Janice
I use multiple pens but I am seriously thinking of giving this a try. It would be so much more convenient to carry than a bag of pens :)
Kurazaybo
I like multipens, particularly when they include a mechanical pencil. Just tried this paper mate pen and it writes very smoothly. I had been using bics for years, but the ink kinda dries or something =( Love these.