pros
price as usually cheaper to buy in europe in the past
depends on marque but means more models to choose from
cons
paperwork, costs and hassles if self importing
value as it's an import it's usually worth less than a UK equivalent liek for like
stigma over owning one narrows resale market a bit
some grey imports can be so unique can cause issues with parts etc
spec can sometimes be less even for same model UK
less warranty ??
horses for courses really, we used to get a lot of customer's test driving in the past then self importing and coming to us to complain they had no rear speakers and their model had no rear electric windows etc and got quite bemused when they realised warranty wasn't paying for it.
be wise, research and buy open eyed you can get some bargains and some cracking cars too