Picture of my Buffalo drive atop my MacPro, although it is usually attached to a Windows Vista machine.
The drive works with my MacPro (Leopard/10.5.x; 8-core) and, while I have yet to burn a Blu-ray disc with the unit, I have read and written CDs and DVDs with it on the MacPro with no problem. Since my Roxio Toast 9 Titanium recognizes it and I can play CDs and DVDs from this drive, I think it is safe to assume that it does indeed work with MacOS.
Even then – assuming you could burn Blu-ray discs on the MacPro – they probably won’t playback on the Mac – you’ll have to use a standalone player or Windows-based setup with appropriate add-ons to do that.
Model of BuffaloTech unit: BRHC-6316U2-US
Mechanism model number: HL-DT-ST BD-RE GGW-H20N (probably made by LG)