Just if you only really have no other options. I have rented from various companies at the airport, some bookings via Aer Lingus, some with Ryanair. It has never been pain-free. Hidden charges, the hard selling of extras.
On one occasion I used a business issued debt card to pay for the car some 4 weeks in advance plus additional insurance cover (Ryanair), payment went through fine. At the pick up they tried to sell me extra insurance, the insurance I had already purchased 4 weeks earlier, I declined then they said the company debt card was not accepted. Given I had already paid this some weeks earlier I found this slightly confusing. In the end, I had to use a personal credit card and seek a refund.
Also, its takes weeks to get your security deposit back, anything to fleece the customer.
Now I use taxies / Uber, a lot less painful.