I think Robin is right that they need to get some established spectroscopists to use it and publish results.
However, I would have to say i think all commercial spectroscopes (and my home made ones) have issues of one kind or another.
I had a Lhres III which had light leaks, was mechanically unstable, required focusing if you shifted wavelength via a crude mechanism etc.Then I had Lisa, it had fishtails and a flat lamp that produced flats with strong gradients etc. I will pass over the issues with mine!
I like the idea of air slits and all reflective oprics on the sx spectroscope but don’t like the beam splitter and not being able to see the star on the slit etc.