Your local RAS office in Sligo will be able to advise on the going rental rate for your area. Usually slightly lower than the going rate for private lettings.
I have a house rented in Lucan, Dublin to RAS for the last year and so far, all is good.
Pros: The tenants were well vetted, they need Garda clearance before they can apply for RAS. Long term rental security for landlord, regardless of whether the property is occupied or not. Rental income is paid directly by RAS into bank account.
Cons: none that I can see so far. If you need to sell the property during the term of the RAS contract, adequate notice is required.
Hope this helps.