My '99 Astra has just gone over the 100k mark. 20k of those have been put on during the two years I've owned it.
My 2010 Astra is nearing 100k. Time for a cambelt soon.
I loved my Vectra B SRI. 50mpg if you drove sensibly, performance was ok, nothing to set the world on fire, but ok.
It did suffer with a management problem occasionally something would light up on the dash, I usually ignored it, it ran fine.
My favoured MOT station, his wife had exactly the same model...same problem. She did the same, just ignored it.
My son's had two Vectra Cs...one is a SRI estate, goes like the wind for a humungous car. Mind, he's had both DMFs fail on them.
Middling cars, nothing terrible, nothing brilliant.