Bob,
Several years ago, I owned a Flex 6700. Among several factors leading to its sale, I was annoyed by low-level switch-mode spurs from an internal DC-DC converter, the amplitude of which was highly dependent on the SCU Faraday cage's contact tightness. These spurs were generally below band noise with an antenna connected but not on each band. To solve the problem, I machined a pair of Delrin rods with a center screw that pressed the SCU cage's cover against the side chassis rail. Crude, but it worked. Even better would be to solder the cover finger contacts but that would then render components inside the SCU impossible to fix.
My ANAN 7000DLE also has some low-level switching spurs from a DC-DC converter on the Orion II board. With an antenna connected, no spur approaches the noise floor. Moreover, the switching frequency was selected such that nearly all spurs fall outside the ham bands. I see no spurs on 6m.
Regarding the Sherwoood list, with RMDR of 110 dB or greater, I cannot imagine a situation where it will matter, apart from a co-locate operation like Field Day.
My ANAN 7000DLE operates in full-duplex CW QSK mode. The sidetone is my own transmitted signal -- not the internally-generated sidetone generator. With ASIO audio drivers, I have no ear-hand coordination issues up to my maximum ability to send with a paddle, which is about 40 wpm. Low-latency and phase-linear filters can be selected in Thetis control software. There are absolutely no QSK artifacts, even past 50 wpm. When I say none, I mean none. Have a listen to a .WAV file I uploaded to the Apache Labs forum. The Apache website would not accept an uncompressed .WAV file. So, what's heard is slightly noisy due to digital compression for the upload.
https://community.apache-labs.com/download/file.php?id=2590More info here:
https://community.apache-labs.com/viewtopic.php?f=14&t=3920&p=19664&hilit=w9ac+cw+qsk#p19664Operationally, the ANAN has been fantastic when paired with a DJControl Compact MIDI controller and Stream Deck device. Every knob, each VFO, switch, and function-assignable button is where I want them. I'm no longer held hostage to the ergonomics dictated by the manufacturer. The Stream Deck has been programmed with multiple pages. For example, memories, VFO splits with macros, DSP, band-stacking all have dedicated pages, each of which is only one layer under the home screen. The home screen also has a button for commonly used websites. Logos are saved as .JPG images and uploaded to the respective website button. See the top of my QRZ page for an example.
Paul, W9AC