Horrible!! All 10 refills I purchased were dry even though I purchased them over
a 6 month period through three separate transactions.. I would not recommend it.
You can use the Zebra refills for the Dr. Grip multi pens, which are what I've
switched to! (same price)
I really like the 0.7mm ink better than the 0.5 because it seems to write
smoother and is more legible. I had a previous problem with the refills being
too long for my Uniball Jetstream but these fit perfectly.
I use this refill in my Pilot Down Force pens for work and they are great
documentation requiring ballpoint pens
I have never had an issue with consistency. I have used multiple refills of it
too. Been using them for over a year now. Just buying some more today!