£300 to fit a new one sounds like a rip off. A new one for my Jag 2.2 diesel was about £100 and took about 20 minutes to fit - my first one lasted about 23,000 miles. Knowing the trips I was doing would cause problems again I sold it and went back to a petrol.
For the inconvenience caused when they do go (limp mode etc) it's almost worth treating them as a service item and fitting a new one every couple of years to prevent problems.
How long they last depends very much on the trips you do and the fuels used.
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