Check out posts by Kenny123 at WBF. My experience is limited to Startech SFP1000ZXST which I found overly bright. Sonore's Multimode SFP's and cable which I found overly dark. And Finisar 1318 which I enjoy. Kenny recommended Finisar 1324 which I finally found on ebay and are being delivered shortly.
I have a Startech fiber and an also waiting on another fiber cable to be delivered.
To answer your question about the ENO filter I just removed mine and immediately found the sound dull glossed over and lifeless in comparison, but if I didn't have the ENO I would probably think it sounds good. The ENO is between an EtherRegen and SOtM sNH-10G which are connected by the fiber and both clocked by a MutecRef10. I just put the ENO back and all's well again. And for full disclosure there is SOtM dCBL CAT7 between the ER and ENO, the ENO cable is very short.
I have a Startech fiber and an also waiting on another fiber cable to be delivered.
To answer your question about the ENO filter I just removed mine and immediately found the sound dull glossed over and lifeless in comparison, but if I didn't have the ENO I would probably think it sounds good. The ENO is between an EtherRegen and SOtM sNH-10G which are connected by the fiber and both clocked by a MutecRef10. I just put the ENO back and all's well again. And for full disclosure there is SOtM dCBL CAT7 between the ER and ENO, the ENO cable is very short.