I upgraded from a 16 series 1 to ET5. I enjoyed both and could happily live with either one. With the ET5 you will get a more dynamic and better defined sound stage. It is a little dryer sounding than the 16. One big advantage to ET5 is that it only uses one tube and greatly reduces the re-tubing costs. In the end I am glad I made the change.
System: Wilson Watt/Puppy 7, Cary 805C, CJ ET5, Berkley DAC, CJ 15 series 2, VPI TNT 3.5 turntable
System: Wilson Watt/Puppy 7, Cary 805C, CJ ET5, Berkley DAC, CJ 15 series 2, VPI TNT 3.5 turntable