Don’t see myself replacing my Apt Holman, but if I didn’t have that, I’d certainly consider this and the Waxwing as options.
I don't see it as replacing my pair of APT/Holman's:
Quadraphonic Synthesis
With two Holman Preamplifiers, you can synthesis and control four output channels from just two input channels.
Apply all your inputs to the first Holman Preamplifier. Use it for all your tone controls, filters and source and tape selections. Leave its Stereo Mode in Stereo.
Connect the first Holman Preamplifier's MAIN 1 output to one power amplifier and your two front speakers.
Connect the first Holman Preamplifier's MAIN 2 output to any line-level input of the second Holman Preamplifier.
Connect the second Holman Preamplifier's MAIN 1 output to the power amplifier for your two rear speakers.
Rotate the second Holman Preamplifier's stereo mode control to L-R, and start by setting it to about unity gain or a bit less, and keep its tone controls flat. The tone and filter settings of the first Holman Preamplifier are fed automatically to the second Holman Preamplifier.
Set balance on the first preamp. Set front-rear balance on the Volume control of the second preamp.
Leave the power switch of the second preamp ON, and plug its power cord into a switched outlet of the first Holman Preamplifier. Now the power is controlled by the first Holman Preamplifier, too.
But I do see it possibly as in addition to them.
Or a Michael Fidler (Classic Audio) creation.
Waxwing: anything that uses my phone as a control interface is out. Although, their prior things are just fine to me except the SINAD).
Once I am home, the phone sits on a shelf by the door with all incoming blocked except my mother & a few select friends (& these days: Dr.'s)
And, IF it is with me in my vehicle when I am out & about, it stays in the vehicle when I am getting fuel, out boating (I then have a VHS radio with me), in a store, the movie theater, at the Farmer's market or where ever.
I have made the phone into an item for my convenience, as opposed to for other peoples convenience.