Pros
I really enjoy working for Ryanair. Lean organizational structure. You'll have close contact/ exposure to senior management. Great environment to learn about business and sales strategies. Excellent environment to promote experiments and learn quickly given the high volumes. Get the feeling of an early state business living inside a big company that is not scared of making mistakes. As it happens in the army, the system is brutal so you'll end up bonding with your peers to survive. I made great friends at Ryanair. After a few years here you'll be prepared for the market. Relatively easy access to valuable data and tools to make data-informed decisions. Here, done is better than perfect. This is a fast-paced environment.
Cons
Compensation is below the market standard. The bonus compensation is never paid fully. 50% depends on the company's performance (and the target is always aggressive). The other 50% will depend on your individual performance (It is believed that everyone could do better and I agree, but that also means you'll almost certainly never get 100% of that 50%). If you have an ego or is the sensitive type, just save yourself some time and don't join. This is a place for killers. As a PO/ PM trying to achieve business goals you'll almost certainly have heated discussions with UX/ UI and Legal - The shopping experience is naturally approved to perform, not to be smooth. The white and blue tickets you'll get are not a big deal. With the white tickets, you're not guaranteed a seat in the aircraft, so if the plane is full you'll be left behind (hard to plan a weekend away not knowing you'll be able to return to work on Monday :D ). The 5 Blue tickets you'll get per year (after your probation period) need to be booked 3 months in advance when you wish to travel in the high season. Long probation period (1 year).