Don't get me wrong, the RS2 engine is basically a good engine and with a good inlet and exhaust system it will give the old 2.8 capri engine a good run for it's money.
It's a little lighter than a boat anchor pinto and you start out with 50% more power.
Things to watch out for are air locks in the cooling system which will cause cracked heads, and melted pistons on the 2.3's
The timing chain guide rubbing strips can wear and be a problem but that goes for all versions of the DOHC engine (and all ford Duratorq diesels for that matter)
Other than that there are no real vices and with it's decent porting it's capable of producing a lot more power than a Zetec. (240+bhp @7800rpm)
BV