Personally I wouldn't do business with a company that didn't reply in a timely manner. That lack of response makes me suspect that their customer service isn't at a level that I would accept.
There are other options for touring Ireland too.
I did a trip there back in 2003 (you can see my journal at http://www.crazyguyonabike.com/journ...ise2003ireland if you're interested in my experience). My tour was solo & self-supported, but I had Tony Boyd of http://www.irondonkey.com plan the trip for me. That was my lazy approach to trip planning (or non-planning) that year. I had a really good experience with them, from emails requesting info and full of questions that were answered quickly, to getting references (I think I talked to one couple for over an hour about their experiences), to a phone call with Tony before I made my final decision.
Iron Donkey arranges tours like the one that I took on my own - but they also run supported tours. It's probably worth checking their web site out to see if one of their supported tours goes where you want to wander.
I can't remember who it is, but at least one other forum participant also had a good experience with Iron Donkey. Maybe she'll chime in...
--- Denise