Tried it out on different servers, and especially the Healer mercs is very buggy.
Noted the same disapearing issues others posted and the stances apear and disapears completely randomly.
I noticed this about the healer mercs:
1. at lvl 1-9. They seem to have tons of hp and mana and they can tank without loosing much hp/mana
2. at lvl 1-9 they cast minor/light Healing on you at like 15% hp *once* and stop when your over 20% and never uses their mana pool (to top your hp). they will however recast minor/light healing on you to keep you alive if you grab just about the right amount of mobs where the merc can still keep you alive between 0-20% hp
3. At lvl 10 they get Healing, and they go crazy. Now they will cast Healing on you when your at 95% and keep doing it whenever you fall under 95% till they are oom (wich happens fast).
I am no real coder, tho still an IT professional.
Seems to me that the scripts controlling when to cast and what to cast at different lvls could need some work
The different stances isn't really that important for basic healer merc usage, as "balanced" from live always seems to do the work just fine
Biggest problem is that the issues about lvl 10+ with *Healing* and casting at 95% clashes with the fact that many Emu server builds have the problem that your HP info typically shows 90-94%/100%
I have run across some server moderators that was aware of the problem with HP not going to full 100/100 % Some knew how to fix it, some didn't (I don't know it myself)