I went with a company offering a similar deal to homebuy/sell, directmortgages.ie I think it was. It was €975 plus the vat and the outlays and I didn't get a mortgage from them, but not sure if that has changed in the 2 months since then.
The VAT brings it to around 1200 and we paid a total of 600 in outlays. Our house was done on the cheapr of the two methods (Land Registry and Registry of Deeds) not sure which and the other is a good bit more expensive which is why they can't give a final figure until theyve looked at the deeds to find out which one they fall under.
Going flat fee makes FAR more sense than a percentage of the fee, and if you get it for a grand plus vat plus outlay you are guaranteed to be saving money on the old percentage based approach. Make sure you are issued a statement of account with breakdown of each outlay and contest this if you have issue with it.