To do a review on an eraser seems pretty odd but after going through many low quality erasers I found one that, for me, works very well. It is the Pentel Hi-Polymer eraser. It doesn’t look like the typical pink eraser but is rather white. It comes in a little cardboard case with the tip of the eraser exposed - I believe this cardboard helps keep grease from your skin getting on the eraser and making it less effective.
It works very well and I have not run into any pencil mark that it could not easily remove. Sometimes with darker marks, ones that have been applied with great pressure, a typical pink eraser would not do too well, but the Pentel eraser will get them off in a few strokes.
Nothing much can be said about comfort since it is just a rectangle, nothing special in terms of comfort has been put into it.