The full detail of the cover is here: https://www.bmw-warranty.ie/Start

Comprehensive is the same as the BMW used car one, covers nearly everything. I had it for a year on a E60 M5 a good while back and claimed a few bits on it. I didn't bother doing it for my old M3 or the M2 when the manufactures warranty ran out last year.

I guess it depends on your attitude to risk, €1,800 per year would cover a decent bit of work unless something big goes pop. I also think you have to continuously get the car serviced with BMW for it to apply.

The M2 was €1100 with 0 excess, so 1,800 seems steep.