The recent v0.1.20-alpha update to CubicSDR works very well on MacOS and in particular with the SDRPlay. These things just look like a black plastic box and I haven't seen any pictures of the internals so here you go:
As you see not much there, but it has 8 automatically switched input band pass filters. Full technical information is here.
It interfaces with SDR software via SoapySDR:
And works really well.