Reddit reviews Paper Mate Tuff Stuff Eraser Stick (64801)

Cheap and good: Staedtler 925: 3-pack of 0.3mm, 0.5mm, and 0.7mm for $20. Individually sold at art/stationary stores for $5-$10 each.

The metal version by Pentel: GraphGear 500: 4-pack of 0.3mm, 0.5mm, 0.7mm and 0.9mm for $20. Individually sold at stores for $10-$20 each. They're okay, and people like the metal look, but I prefer the Staedtler.

The good stuff: rOtring. rOtring 600: $23. rOtring 800: $50.

I haven't tried the rOtring pencils myself; I've heard they're good, but I've been pretty happy with the Staedtlers. Although they're the cheapest I mentioned, they're also very comfortable and reliable. I've never had one fail (I have had Pentel pencils fail, including but not limited to the ones I linked), and I've been using them for years.

Make sure you get a decent mechanical eraser to go with them. A Tombow MONO zero in an amazing eraser for the details, and a Sanford Paper Mate Tuff Stuff is good for everything else. Buy an extra pack of the refills and you're good for a while. Note: Do not buy the Sanford eraser for more than $5. The price on Amazon right now is ridiculous. The Tombow is a little more pricy; $5-$10 is fair for it.

Usually the eraser is an afterthought- a tiny little thing under a cap.

I prefer using separate erasers anyway (e.g. one of these), so I just use the little tiny eraser when I forget my usual eraser.

That is why I carried one of these back in my engineering/physics days.

Now that I am in computer science, I don't bother.