For what it's worth, I've been using a BabyFace Pro on Mac for years, ADAT-connected to an RME rack ADC/DAC to enable all available audio channels, and it's been as rock-solid as any hardware I've ever owned.
Note that, while the BabyFace Pro doesn't have native Linux or BSD drivers, it does have a USB class-compliant mode that, while feature-limited compared to the proprietary drivers, may be sufficient for DAW use — AFAIK, the primary limitation is limited control over the hardware mixer, so problematic if you need low-latency monitoring of multiple input channels simultaneously, but possibly irrelevant otherwise.
There's also a full-featured iPad mixer app that works in class-compliant mode, so full control is at least theoretically possible, lack of published details notwithstanding, and there appears to be at least some support for this in the Linux kernel,