I have not used one of these before. Are they good?
I want a spring mattress and was thinking of putting a protector on it, but maybe I could get the water proof type insted? I am concerned about the mattress breathing.

What are the pros and cons of water proof mattress when compared to a mattress with separate protector?

And would you use a 2nd hand one or do you think thats a bit yuck? I wouldnt have a problem with a 2nd matress that had been looked after with a removable cover, so not sure if its any different.