I am currently using the ARC Ref3 paired up with 28B SST Squared and very happy with the end results, I have not compared this specific set-up with any other pre-amps but have done so in the past with other amps and set-ups and still kept the Ref3, waiting to try the new Ref5 to hear what the difference is. There is allot more than just putting a pce into your set-up, it's like being a baker and having all those different ingredients and in the end putting it together, the end result. No one really being wrong or right just different, some like it mild and some hot etc. In the end it really comes down to what you want and your specific preference. I have heard alot of set ups over the years and found it's best to just appreciate what one is trying to do and learn what you like and don't like, in the end it's a hobby and to me really it's all about music, meeting new people and learning etc.
My system consist of;
MBL 101E speakers, MBL 1621A Reference transport, Accustic Arts Reference Hybrid Tube Dac, ARC Ref3 pre, Bryston 28 B SST Squared mono's, 2 Torus RM 20's one for each amp, Stealth Dream speaker cables (two runs to each speaker for true-by wire), Stealth Dream power cords through out, Stealth Indra XLR interconnects, Stealth Sextet Digital cable