Similar experience here. I've been cursing at RME support a bunch of times, but now that the new HDSP drivers are out my last issues ( sleep mode on powerbook, reinserting cardbus card w/o reboot ) have been worked out and I can integrate my powerbook into the studio without hassles. I'm using the HDSP Multiface / Cardbus combo. - The converters to my ears sound very good, tons better than the 828 I had here as a tryout. The only thing lacking on the mac is the very cool Digicheck software, but I have the HDSP PCI interface in my PC, so I can swap the Multiface back and forth easily. Good to be here, by the way, been lurking for a while and gearslutz seems to be a great place to come for advice and chatter.