Disc or Holy for 2s?

I didnt play for some time on MOP. I used to run with holy spec for rbgs and 2s but I want to know whats the state of those specs now?

Also I have problems with mana management in holy spec? Any help?

Any major bugs?

I think that holy is pretty good now in bg and also in arena with monk or feral. Remember that in holy spec you have one more stun than disc..!

Like Holy priest, about mona problem, you must try to have always sanctuary up and stay on it (and maybe other players in bg.. you must choose with attention the location), that's give you more chance to proc fdcl (istant flash heal at free mana cost). I try to never cast flash heal without fdcl proc, becouse it's too expansive mana talking (and you can be interrupt); anyway when this is necessary, I use power infusion (20% less mana cost for 20 sec every 2 min). Play shadowfiend every time you can and if you it have up, cast divine hymn before just for the buff (much more mana reg).
Last one, try to cast in sequence prayer of mending (see bonus set holy spark) -> serenity -> flash heal istant, and try always to repop renew on target with flash heal in chakra: serenity to maximize your heal.