Hi,
No, we don't know each other. Am just curious to find out more of the discussion about the specnext on your mailing list. Can you publish a link please?
If you want to say the spectrum next would only be experimental then no.
Spectrum next is a well tested FPGA implementation. It's prototypes were called TBBlue.
All perfectly running. There were prototypes that had no expansion port and later victor trucco made the prototype with expansion port.
The disadvantage of spectrum next is that there is nearly every cell of the fpga used.
It's so full that ZX80, ZX81 and Jupiter ace are not synthetic but spectrum emulators for these (cartridge from Paul farrow).
So QL won't fit inside.
And ZXUno has a larger FPGA and will definitely be cheaper than spectrum next.
kind regards Paul