LaCie - no panic, but a logageddon happens no big deal. read speed 15-20 MBps, write speed almost the same (blackmagic disk speed test).
Oyen Digital - no panic.. yet, no log flood. read speed ~20, write speed ~50. i use it as a solution for the first time.
I've tried all of these as well with my Pro and if I inject ven/dev IDs into ASMX to get the rear hub-connected ports going I got a KP with the Oyen driver as well. Maybe it's just a 10.6 thing. At the moment I'm using the Oyen with just the front USB ports.
There's a patched copy of the Lacie to take care of the logging but ultimately I found it didn't work as well as the CalDigit/Oyen drivers.