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I have seen a lot of reviews on these pens. Almost everyone agrees that they are wonderful pens and that they last for years. A lot of people continue to complain about cleaning the pens, and about the fragility of the tip of the pen (you can bend the wire inside the tip if you aren't careful while cleaning it, rendering the pen useless).
I've only been using Radiograph pens for three years now, but I use them constantly. I draw with them and, for the past two years, I have used them to take hundreds of pages of notes in class. I write with them instead of using regular pens. Using these pens requires a somewhat gentle hand. If you don't use them properly, you are likely to break them and you will wear them down very quickly.
As far as claims in other reviews that the pens stop working or that the ink clogs constantly I have not ever had a problem with this.
If you leave ink in the pens and you do not use them for a number of months, you will have to clean the pens. (This is true of any pen that takes a thicker, more potent ink.) This involves careful disassembly. Cleaning these pens is very similar to trying to clean older calligraphy pens you're bound to have ink all over your hands for a day or two, but, if you are patient, you can clean them completely and they are as good as new.
The lines are uniform in color and constant. The pens work well in controlling the flow of ink, and they do not bleed when you are writing with them. If you shake them a lot, ink will splatter everywhere, like a calligraphy pen with an open nib, but everyday wear and tear won't cause the pen to explode (in a purse or backpack), if you want to carry it around. If the ink flow stops for a moment, you simply need to gently shake the pen to allow more ink to flow to the tip, and it will continue to write (taking the pens apart will allow you to understand exactly how the ink is distributed in the pens but be careful when taking out the tip!)
The pens are reliable and they perform beautifully.
These are my favorite pens.
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