I also like it for black-and-white. Colour, too, although I have serious doubts about its longevity there and wouldn't use it with the expectation of a very long display life (by pigment inkjet standards). For black-and-white, there's much less need to worry.
As a Moab product, I would expect Slickrock to use a similar inkjet receptive layer to Entrada, which appears to be a particularly long-lasting substance (although, as a gloss paper, it would obviously have an additional smooth layer over the top). Slickrock is probably heavily loaded with OBAs, though. This is obviously a problem for colour printing, due to colour shifts, but should be much less of a problem for black-and-white printing, since it is density rather than colour that you are primarily concerned with there, and the colour shifts you are concerned about in black-and-white printing tends to be changes in the ink colour, not changes in the paper colour.
I'd probably stick to black and grey inks only, without any additional toning from the colour inks in the inkset. That way, you don't need to worry about varying colour shifts in different parts of the image, due to colour inks fading at different rates over time. There shouldn't be any reason you can't profile it the normal way, either - you aren't profiling for colour, just for density.
Obviously this says nothing about the long-term stability of the underlying plastic layer, though. Old RC papers (at least those used for gelatin photo papers) had the habit. I'm not sure if current inkjet papers are any better - RC papers tend to be designed with price rather than longevity in mind, although this is obviously not the case with products like Slickrock (which may be designed with visual impact instead of longevity in mind). I'm still waiting for someone to do away with the paper base entirely and bring out an archival-grade, perfectly-smooth plastic medium for this kind of output. High-gloss and pearl variants, and possibly a silver variant too. A bit like Fujiflex, but for inkjet. There's been Pictorico, but that's loaded with OBAs (and I'm also not certain about the longevity of the base material). It might be based on a FEP or PTFE base, rather than polyester, for better UV and chemical resistance.
