It doesn't add anywhere near as much as you would expect.... because it's Still not PoF-able. thus is will break with enough use.
It's a hell of a ring though, good luck.
Partly disagree on this post.
I never broke a single antique item since they 1st came out, so ive been enjoying using them for last few years.
Here’s what i do:
I usually carry 2 sets of jewellery (a semi decent imbued set for raiding champ spawns and pvm action and the antique set for pvp in open areas like VvV towns or fighting around yew gate) and i switch around depending on the situation while keeping an eye on the durability marker on my EC paperdoll.
Antique jewellery might not work very well for players who perma play on a single pvper. For me distributing them on 13 characters on different shards solves the bigger part of this problem.