The PR:O 12 is a great sounding speaker for the higher frequencies, so you'll know all about it when the HF diaphragm fails. At approx. 20 euros for the replacement, I found myself fortunate to have such affordable replacement parts for my speakers. Installation was quick and simple, any person can use a screwdriver and that's the only tool needed so do not be afraid to install this yourself. Personally, I've only had one issue with these speakers since I purchased them in 2007, so I'm not too worried about reliability if a self-service repair costs €20 and takes 30 mins every few years.