I'll wait till they are stable.
Also would be great to have a stereo sub version if possible but I guess if the receiver is only putting out one sub channel and the subs are identical it shouldn't matter that much.
Its stable, works like a charm. I can measure and equalize a room in less than 5 minutes. I can also move my sub around getting different room measurements and comparing/contrasting them for the best subwoofer location.
Another trick I've played with is doing the same thing with my speakers. Just the measurement tool is very useful. You don't have to leave it in the circuit. Put the Woofer Widget between the preamp & amplifier and run the room measurement sequence and you can see the in-room response of your main speakers. It allows you to intelligently pick a crossover for the sub and properly position your main speakers to get the best in-room response based upon their location and your listening position.
We are chasing some noise issues though so a lot of the circuit design code had to be re-written. Its nothing that won't be solved but its causing a lot of re-work on the code that configures the circuit.
Just sit tight and let us work through it until I say its good. When I'm happy with the noise floor I'll start selling it.