So, I spent about five hours yesterday listening to my system with the SE (fyi, system includes Lampi Atlantic dac, Ayre AX-5/20 integrated, and Aerial 9 speakers). I have to say it is pretty great. As advertised, it is very quiet and audibly quieter than the UR/Uptone combo. As one would hope for/expect, the quiet background resulted in greater tonal density, more holographic imaging, enhanced separation between instruments, and a deeper soundstage. Unexpectedly (at least for me), I found the bass to be much more extended and detailed. It is definitely more forward than the MR and it may take me some time to adjust to that. Very happy, great product, highly recommended. I can't imagine how great this will sound with the upcoming optical upgrade.
That said, the UR/Uptone combo is terrific and significantly less expensive. I could have happily lived with that combo for many years.