Originally Posted by Optimus Prime

comes down to reliability. mine the commercial version which I use for work and it's packed out with gear. To be without it is a major ache, so I saw it as preventative maintenance.

Luckily, when the injector (no. 2 incidentally) failed, I was at home, so the inconvenience was minor as I could unload at home into my shed before it was trailered away, and organise alternative transport.

Had I have been 300 miles (or further away) it would have been a right nightmare