I flew this week with my housing in the hold, but camera in carry on. I fly with Ryanair very regularly as they are the only option between the town/island where I live and the UK.
Ryanair are fine with baggage handling. They have never lost an item of mine. And their flights are very punctual.
However, their whole system is designed to trip you up at each stage of the process - and if you trip up they charge you for it - and they don't accept cash and they charge you for using a card etc etc. They change their rules frequently to increase the chances of catching you out!
That said - if you know all their rules and their idiosyncratic little ways - it is easy to get one up on the system. A great deal of smugness comes from flying for next to nothing and not getting caught out. I just came home with 40kg of luggage and got an extra legroom exit row seat and paid no extra charges. Alex 1, Ryanair 0!
They are strict on the size of carry on - but they have never once enforced/checked the weight of my carry on this year. In previous years they would weigh them at check in and then again at the gate. But this year they haven't cared. Changing the rules, or how they enforce them is very Ryanair.
Alex
p.s. All that said, for divers flying lo-cost in Europe - Easyjet are a better bet. They have no weight limit on carry on (single piece only) and you can pay for an additional dive bag in hold (up to 12kg extra, in addition to 20kg bag).