I've read that by investing using say Davy's, that with this you pay regular income tax %s as opposed to CGT. The major appeal of these funds is in their low fees - as low as 0.06 for Vanguard. However, Davy's is charging close to 1% which when compounded over the term of your investment will decrease your return by a huge amount.
If you invest 100k for 30 years at a rate of 5% per annum, without fees the value at the end of term would be 423k. If you add fees of 0.96%, the final sum is down 25%. In comparison, if you got the original 0.06% rate, the final sum would be down a mere 1.78%. That's a pretty massive difference.