We're looking at it too and think we'll be going for it.
Live in Ashtown at the moment and agree with some of what Blackknight says but think the addition of the new houses at the Royal Canal Park end will help to make a big difference there. It's a bit of a gamble on the future, and the last purchasers in RCP got a bit screwed by the same gamble, but nevertheless . . .
Broombridge does suck as a station at the moment but the Luas will be there in less than two years (they're building it at the moment, otherwise I wouldn't count on it), which means including a 15 minute walk it'll be 25 minutes to O'Connell St, or 36 minutes to Stephens Green. It's also 10 minutes from the M50, so for any future job moves, I feel like we're well covered.
Parks wise, there's a new park going in as part of the development which is included in the local area development plan (less likely to disappear when the builders decide they want to build on it), it's also next to the canal and it's very close to the Tolka River Valley park which I love but no one else seems to know exists. There's also a new access point going into the Tolka River Valley Park from the new park which helps. They seem to have started the landscaping for that on river road so there's good hope it'll actually happen.
Shops and businesses wise. There's a centra & creche already which is close to Phase 1 and Phase 2. There is a village centre there where no business has ever really managed to set up (except the about to open take away). With the new houses in this development plus the other planned developments in the area I think there's some chance of that improving. As it is, we tend to stop in SuperValu Ashtown on the way home (driving) anyway, so it's not a total dealbreaker if it doesn't happen.
Schools wise, the Pelletstown educate together has started and is at junior infants level. They've no proper building yet, but at least it exists as a school. A site is identified but no planning permission in. Being pessimistic, I'd say there's a 50% chance that it'll be 10 years before a school is built but my sisters were in a similar situation in primary school and it seemed to work ok. The proposed location is a 10 minute walk from Phase 1 & Phase 2, current location (beside SuperValu) is a bit more awkward but still manageable.
There's a few other developments slated for the area that pique my interest but which I don't count on - the new train station at Royal Canal Park itself. This is apparently at design stage, and will include a footbridge to Ashington. If it happens, it'll make Tesco Cabra, the Cabra Library and all the bus routes on the Navan road 15 minutes walk. There's also a plan to build a proper cycle route along the whole royal canal, which would make the journey to town very convenient.
Overall for the location and price I think it's a good buy.