Hello,
I have this amp for 15 days but I had the C326 for 8 days.
I have not kept the C326BEE because he had not low (it takes the driver of the 66 studio monitor)
with the C355BEE is a hundred times better, the truth appears serious.
For the dynamics, no big change at 326
We can make better for the 66, there are more than 10 years, I had a NAD amp-preamp separate from the Monitor series of 2x150W, I seem to remember we went down even lower but for triple the price of 355
Conclusion: it is well worth its price (80 euro more than 326, should not hesitate to put them)
Regards.