Quote Originally Posted by Woolliscroft
The OM2n allows TTL flash metering using the OM dedicated flashes, the OM2 does not. I'd call that something serious and it is well worth holding out for the n version.
My OM2 operates quite nicely with an Auto310 flash in TTL mode. Like others have mentioned, the OM2s has some improved circuitry but for flash unit coupling, other than an extra LED for flash readiness in the viewfinder, the older Auto310 does work TTL.