you realise the SX and A are no different with the exception of a paintjob and some bundled sounds?
In fact when I switch my 404A on the loading text says “SP404SX” scrolling cross the screen.
I can attest to the other comments about the units usability, this machine is a joy to use. i pair mine with a digitakt and volca FM. I use the Digitakt for the beats and the SP handles the stereo sampling, the FM is for my bass lines.
Strange thing is I can actually edit a sample way quicker on the 404 as opposed to the Digitakt and it dosen’t even have a screen to see the wave form.