I've had plenty of these and whist I do see merits over lever fills in regards to longevity and lack of ability to go wrong. In the sense there are no levers to break and they lack the weak point on the barrel where the circlip sits.
However I find in general button fill pens are hard to fill. In the sense some are so stiff you have grip extremely firmly to fill them as the force required to push the button is so great. I sometimes worry that I am a slip away from ploughing into the bottom of the ink bottle. Then there is need to have a higher ink level in a bottle then most other methods. As having the nib resting against the bottom of the bottle isn't an option as the worry of a slip is still there and with no margin space between the nib and bottom of the bottle the risk is far greater.
I've tried repo bars and originals but it's potluck weather a pen is so stiff you have to tense your forearm to get it to draw ink.
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