"Good for what they are" is a very low bar, Herr Professor. All shit pens are good for what they are; shit pens.
What Levengers are not good for, are good fountain pens. Of course they write, damn near any pen does, but that's hardly a reason to cough up what Levenger charges for them, nor is it justification for what you end up with should you fall for Levnenger's schmalzy, pseudo intellectual/literary hype and their cheesy candy-colors--as evidently you have, Herr Professor? And on more than one occasion it would seem, as well! This leads me to surmise, among other things, that you are neither a professor of Phycology or Economics!
As to your pen collecting and restoration qualifications, I too have dabbled in the dark arts of pendom and I assure you my pens are legion and my restorative powers are great. I have written extensively on shit pens and have been published many times--right here on MD (where shit pens are often found). Indeed, many would call me a shit pen expert! So you see, Herr Professor, you contradict me at the risk of revealing your true identity! You are a Levenger groupie!!!
Don't try to claim otherwise, Herr Professor! Do you deny for instance that you own, and have often been seen carrying a Circa Herringbone Bookcloth Foldover Notebook with corresponding Rose Gold Aluminum 1" Circa Discs? Do you?! I thought so! And tell me, Herr Professor, do you not carry your extensive collection of Truewriters in a Mocha Bomber Jacket Pen Case with Pouch? Do you?! Answer me!! Of course you do; you and your kind always does!
My advise to you, Herr Professor, is to buy some new pens--before it's too late!