I have not heard any Jeff Rowland equipment to compare against Coda amps. But, I have 2 power amps built by Coda. One of them is a Continuum "Ultra" version and the other is a Stage 3.3. They make these in integrated also. Coda amps have a very high reserve capacity which delivers a very powerful, natural and transparent sound from the lowest bass note to the softness of brushes dancing on a drum. Output is >50A per channel. I am very pleased with the detail these amps provide, whether listening to jazz, rock-n-roll, or movies. If your interested in more info on Coda amps, Call Mark or Doug at Coda. They are very helpful and they have a 14 day in home audition offer. There was a very good review in Stereophile May 2005 issue on the S5 which I feel is accurate.
http://www.coda-continuum.com/
http://www.coda-continuum.com/