I am quite curious about the pros and cons, for the Lelit E and in general.
I used to descale my Breville DuoPro (one bit the bullet, the other I use at my cottage, for the moment) with diluted vinegar. Then I was told by my local espresso machine repair tech that this is a big no no, and that I should only use espresso descaling solution from my local Espresso equipment supply store. And so I did, on the BDP.
But I have not descaled my Lelit E, having read @DavecUK ’s maintenance bible. And given that I only use @Rob1 ’s ZeroWater and sodium bicarbonate recipe, and fully flush my machine bi-weekly, I wonder whether I will need to or should ever descale.