If you go to a reputable law firm in any country, then you will have no problems. If in doubt, ask the commercial attache in the Irish or UK embassy for a list (although these tend to be the high-end legal firms and can cost more). There is a myth out there (often perpetuated by Irish lawyers) that lawyers in other countries are somehow less qualified or less regulated, which is rubbish.
Irish law firms that pretend to have expertise in overseas markets are usually just engaged in a subcontracting operation to law firms in the target country, often through an additional middleman in the UK where this kind of racket originated. I know of one Irish guy who had a legal problem in Spain that needed sorting out fairly quickly. He already had a good lawyer in Spain, but was scared by the hype into engaging an Irish law firm that purported to have Spanish expertise. They subcontracted to a London firm who then subcontracted to a firm in Madrid who in turn subcontracted to his own original Spanish lawyer, but at twice the rate originally quoted by the original lawyer. Neither the Irish law firm nor the Madrid firm had any knowledge of the local situation, they were just cashing in on the client's fears. In fact, he went with the original deal with the local lawyer and cut out the middlemen.
I have no real problem with people paying twice for the service if that is what they want to do, and Irish lawyers have to live too! My problem is the bad advice thet Irish lawyers can and do give to Irish clients, and their absolute lack of local knowledge of developers etc. In addition, they do not have any knowledge of the law or the legal system in the target countries, nor could they be expected to.
If you look at this the other way round you will see the logic of it. If you were a Hungarian from Budapest and you wanted to buy a house in Carlow, would you use a Budapest law firm to do the conveyamce or a Carlow based lawyer? Of course you would use the latter; he or she would know all the planning issues and legal questions around a local project, and conversely the Budapest lawyer would be lost. The Carlow lawyer would also know the land and the developer, and would be able to advise you of problems that might not immediately be obvious.
Still, there is no doubt that the practice of using Irish law firms is a good way to allow the Irish legal profession to share in the bonanza of irish buyers investing abroad, and sure they have to get a slice of the action too! If they simply added a cost it would be ok, but they introduce delays and the possibility of confusion with too many layers in the picture. Best to go direct to the source.