I've had 6 cat d's, wouldn't hesistate, last mk2 astra I got was written off for a badly dented sill along the whole length, stolen recovered, never even bothered knocking the sill out, painted them black and you had to really look to see it.
Me gf's present car is a mk3 astra, that was written off for a DENT, about 3mm deep and 1" long, valued at £450, the persons insurers who damaged it and my own insurers said write off, I said fine give me the money, that was 4 years ago, I still drive the car and it is still insured with the same insurer as at time when it was hit, the claim was due to PI, but car was officially written off, so what, does the job, never did fix the damage, keep forgetting and have to hunt for it whe I remember it's that slight, but mate quoted for a complete rear 1/4 so!!
tabetha