I still have the OS surrounds, the ER's however have been replaced by a pair of DTQWT's which is a completely different ballpark.
I buildt to subs just to support the ER's from the bottom and up to around 200hz, and crossed over the ER's at 200 with a minidsp. This helped a lot, but i was never really happy with it, so when a DTQWT kit apeared on the marked for a great price (a guy bought it but never buildt) i grabbed it and i dont think they will be replaced ever.
So now i have a pair of ER18's for sale