I hear bad reviews of the F-3's as well. I demod them (F-3) in the store and found them to be better than anything else that was on the shelf at the time.(compared to JBL, Bose, Sony, KLH, bleh) But there was something missing. There was no backbone to the sound. The bass was lacking and that good ole Klipsch "KICK" was completely gone! However, they DID have the F-3's plugged into the cheapest receiver money can buy which COULD be why some people don't give them very good reviews.
In my opinion, I consider Synergy to be a "VALUE LINE" speaker, it would make sense that in the VALUE LINE store, the speakers are placed in an untested "jury-rigged" listening area and plugged into a VALUE LINE receiver which is also hooked up to a VALUE LINE CD/DVD player... Also, I've NEVER heard a Synergy speaker plugged into anything but a low end Pioneer or Sony.
I think that may be why I opted for the Reference speakers, they were plugged into higher-end equipment and they sounded completely different. But I'm not going to buy both and put them in my listening room so I can hear the difference. I don't have that kind of money. lol
I feel that the F-3's would probably have sounded WONDERFUL plugged into my Integra. But I got a deal on the Reference setup and I'm very happy with it.