This machine is growing on me! It does a fine job of being a Spectrum - indeed one of maybe a dozen flavours of Spectrum, and with various extras which would have been aftermarket addons at the time.
But more than that, the built in facilities allow us to run alternative cores - the machine can become any machine that can be described in HDL and synthesised to an LX19 FPGA. That includes Acorn Atom, Amstrad CPC, MSX and so on. And a QL is rumoured. And there’s more in the pipeline, as well as a number of arcade machines.
What I really like is that the Next is compact and portable and self-contained and good to look at, with all the flexibility of an FPGA system, and with firmware and a user interface which keeps all the customisation and configuration on an SD card. There’s no need for any special connectors or dongles. In the event that you load a bad core or mess up the filesystem, you can always recover using a fresh SD card. The card is also a storage device for the system you’re running, whether directly accessible or to provide disk images with other (native) filesystems.