It doesn't seem to happen often that I post a review of sort of everyday office type pens (hopefully I haven't painted myself into a corner!), but I wanted to provide my thoughts on a pen I keep with me at work all the time.
I picked up the Pilot Acroball 3 multipen several months ago and really enjoy having it around as a go-to note taker while on calls with clients and keeping myself organized. If you haven't used an Acroball yet, definitely pick one up and give it a whirl. The refill is awesome and a super smooth writer. Although, the black refill in mine seemed a bit skippy which was odd. The blue (of course) is phenomenal.
The regular Acroball finally hit the US stores within the last year or so, but the multipen market isn't quite as big here so you'll have to find the 3 elsewhere (if you live in the US). I picked mine up from JetPens as an add-on to my order and couldn't be happier with it.
The pen is kind of bulky, but light being all plastic. The barrel has three plungers for black, blue, or red ink (no green, Ana, sorry...) which is pretty standard with these disposable type pens. I'm not super crazy about the clip of the pen as it is one of the goofy spring loaded ones (with the spring exposed underneath), but it is bearable as the pen is so cheap.
I wish they made a metal barrel to house these refills.
The grip is nice and, well, grippy, but the rubber isn't wrapped around the barrel like you might think. It actually IS the barrel in that section and has a ton of flex. It kind of took me by surprise and is a little odd as you can feel the refills jostling around inside if you squeeze enough.
For $7, can't really do much better than this for a "hybrid" ballpoint multi. On your next order from JetPens throw one in the cart for sure.