I would waste so much more time wasting time on reddit without this... Or would I waste less?

I can't imagine reddit without RES. It's become an iconic part of the experience.

It is so good that when I use Reddit on browsers without it I get angry.

It's a MUST HAVE for anyone who usually browses Reddit.

Very useful. The amount of features can be a bit overwhelming for a novice user though, yet useful for an advanced one.

It's nice.

It does what it tells you it does. Enhances the reddit experience with some very fancy features long overdue.
No complaints here

Dunno how some people don't have this :)

Great add-on from the very start. The developer is super-responsive. Reddit isn't Reddit without RES.

working as of 14 Feb 2018