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

Broken, recent issue concerning cookies. Recommended fixes don't work

Extension is "OK" for what it does, however, the main thing I want to use it for is delayed hiding. The problem is that "hiding" with RES is never a permanent hide. Anything hidden comes back on a page refresh. This issue has existed for at least 7 years (apparent from the reddit post dated 7 years ago). I keep checking this extension every few years, but no fix. Oh well.