I know I'm not quite as prolific a poster here versus other forums, but per the OP's request, I will throw in my suggestion as well.
If it were me and I were in the sub market, I would pass on the MFW.
Will the new amps work? Probably.
But this whole experience has really disenchanted me. Throughout this trying extremely drawn out process I have had several private conversations that have given me cause to further question his business practices.
It's saying something that I'd rather spend more money for equal or less performance than buy another MFW, or any other product with an electrical cord from AV123. There are ever increasing choices where to spend $$ from id companies that don't have the black eye that av123 has.
Again, just imo, ymmv, yada yada, etc....