[JDaniel]

Joeaksa,
Not to start debate about what is a PITA and what's easy, but I found the head temp sensor to be a relatively easy swap. I do have a cat bypass pipe so perhaps it was easier for me. The only trouble I had was pushing the ruber grommet back into place.
I'd recomend that anyone with the original DME and HTS on their Carrera replace them as soon as they can scrounge together the $100. It's an easy update to make sure the car is running as it should.