Did when it was new, i'd pay a bit more to have them, just like any option, they cost more when you bought it so yeh, suppose it does add value!
If you've got the choice of getting them front and rear, pay the extra 200-400 quid, i've got them and they looks much better than standard!
 
...dunno, it should do, and if I was buying 2nd hand I'd go for one with Recaros rather than without (front only for me though).

BUT, some people find them uncomfortable.

AND, Recaro's in the rear means it's only a four seater.
 
I have Recaros in mine and i would pay the extra to have them now. Ask nick-barnes07 as he is desperate for a set after sitting in mine. The rear seat a utra cool too:D, however the has too be mint as it is only the seats!!!!