This is definitely a divisive one, and there have been a fair few discussions of it over the course of EA.

Personally, while I know that it’s not per RAW to fail/succeed on a 1/20 for skill checks, it’s a change I (usually!) like and find makes things more tense and interesting.

"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"