I don't have a mk3.
But I have used an 828mkll since 2004 and it has been a rock-solid piece of equipment. First with DP, (even worked with Cubase VST 32/OS9 on a G4.)
Absolutely problem-free with Logic Studio!
MOTU makes very versatile, stable hardware that is compatible with a wide range of operating systems both Mac and PC.
An Apogee Duet sounds sweeter, but the 828 provides more diverse options for connecting various types of equipment.
Cheers