Curse

Well, it works with the supported addons just fine. I happen to use ElvUI without issue (and a number of other users use the other supported ones or none at all).

Regarding Ion, we do not support it for a good reason.  Gagorian emailed the author requesting technical details regarding integration.  However, as of 2 weeks after sending the request, the author had not responded at all to Gagorian.  Without proper details regarding integration, we will not do it.  The structure is NOT the same as the original addon (Macaroon).  As such, improper integration is worse than no integration.  

(Edit to add:  The Ion mod details request was made back in February, by the way.  And, as of this date, that information hasn't been received. This information is also included in the "Known Issues" link in the Wiki on Curse and has been once the question was asked.  This update to the wiki occurred March 6th. (I made the change myself when the question was asked.))

You can give feedback without that addon if you want.  But, utlimately, the choice is yours on which one takes precedence. We cannot and will not make that choice for you.

Edit to add this as well:  We had someone other than the mod author post a partial and buggy patch for Ion support.  Gagorian was specific on this:

"Yes I looked at it and had already earlier figured out what he suggested, the problem is the buttons aren't updated when new buttons are created or spells are moved.. if we'd add a buggy solution like that, next thing there would be a million tickets of Ion support not working correctly."

" I already messaged that guy that I wont use it before the solution is complete."

Right now, the only class that isn't implemented at all is monk.  Other classes may be inaccurate (mostly only a few specs like Discipline due to last minute 5.2 changes) but otherwise mostly functional.

See the current status on the known issues page.  Follow the mod feedback link to test and see how to report bugs/issues.

Update 4/01/2013:  I still need testing for the listed classes.

1.) Paladins (all specs)

2.) Enhancement shaman

3.) Assassination Rogues

4.) Resto druids

5.) Balance druids

6.) Warriors (all specs)

7.) Shadow priests (aqCelestyna@wowace has helped some on this)

8.) DKs (all specs)

9.) Hunters (all specs)

Please follow the known issues and mod feedback links on the wowace site.  So far, I haven't had anyone willing to provide this feedback at all (despite indications that folks were interested).  Less feedback means a much longer period of time to get this into a beta/release state.  

I'm not sure why you would get that kind of error.  The relevant code is:

local chance = 0.2 + (UnitHealth("target") ~= 0 and ((UnitHealth("target") / UnitHealthMax("target")) <= 0.35) or 0)

In essence, the chance to proc earth living weapon is based on target's health.  What you're saying is that the addon is sending a LUA error on this (which doesn't make sense).  Chance is equal to 20% plus (target's health percentage, if under 35% -- otherwise 0).  The only conceivable change I could make is to add an `if UnitisFriend("target","player")` check.  I don't believe that will solve the error in question, however.

That said, I added the probably unnecessary check in r1933.

Update on 03/27/2013:

A few classes that are implemented may need additional testing (as indicated in the Known Issues page) but otherwise may be ready.  Those not listed are not started.

If a class is listed as needing testing, what I would need is this:  You must have knowledge of how theorycraft for your class (at minimum, spec) works.  If a value doesn't match in game to the tooltips, you'll not only need to provide what's on the mod feedback link, but also why the ability displayed doesn't match.

Headhuntress (on Curse/Wowace) was able to do this privately quite well on a couple holy paladin abilities without me asking for it.  As such, that got several key updates in for holy paladins.

If you do not know theorycraft for your class (modifiers, talents, buffs, etc), please hold off on feedback as yet because I will spend more time trying to explain it to you than being able to update the mod.  If I can't use your feedback, at least understand that if something appears wrong and you don't know why, it will likely be fixed at some point.

If a class is listed as needing testing with the above requirements, please follow the mod feedback guidelines on the wowace page (a link to that plus the known issues) is located on the website.  At this time, I'm specifically looking for feedback only on the following specs/classes:

(If not listed, I am not looking for feedback on that spec/class combination)

1.) Paladins (all specs)

2.) Enhancement shaman

3.) Assassination Rogues

4.) Resto druids

5.) Balance druids

6.) Warriors (all specs)

7.) Shadow priests (aqCelestyna@wowace has helped some on this)

8.) DKs (all specs)

9.) Hunters (all specs)

The list ends there.  That should be more than enough to help me get the currently untested classes verified and/or working.

Please send me a PM on this site and I'll tell you what I need to get from you to test.