Even with the discount, if your not using Euro's or $US its still expensive, RootsIreland take their information from the Catholic Parish registers which are freely available on the National Library of Ireland website as does Family Search, FMP and Ancestry, etc., etc. However if you have difficulty reading handwriting or latin, or you don't have the time, or the patience, or the inclination, or any idea which parish your family come from, or your becoming despondent with your research, or you find yourself totally up against that proverbial brick wall, and you have had a win at the races or the lottery, then you might find it good value, so treat yourself to an early Christmas present. They will have that same 25% offer again in a couple of months. Their transcriptions are reasonably good and they do include variants in surnames, their presentation is good and you can also save records. They do have a list in the online sources of what records they have and the time period covered arranged via counties, which is well worth checking before purchasing anything. Apart from Roman Catholic their records also cover Church of Ireland, Presbyterian, Baptist, Congregational, Society of Friends/Quaker and some Registry Offices, apologies if I've left anyone out!
If your looking for "Ryan" or an even more popular surname (if there was ever one) its pretty easy to go through your limit of views.
Last time I checked they did not have records for a lot of parishes in Co. Cork and Co. Kerry. The Irish Genealogy website is pretty good for Civil Records and Cork and Kerry records - https://www.irishgenealogy.ie/en/
Hope this helps.