I've had no problems at all in MD 9.0. I did the install, the card was detected and it works fine. I have my two hard drives on the Promise IDE 1 configured master and slave. On the on board IDE controller I have a DVD drive and an IDE Tape drive on IDE 1 and a CD burner on IDE 2. I have nothing on the Promise IDE 2. I mention that because I recall exchanging emails with someone that tried putting a CD burner on Promise IDE 2 and he couldn't get his hard drive detected on Promise IDE 1 during a Linux install but when he removed the CD burner from Promise IDE 2 everything worked fine. Maybe I'm just lucky.
With MD 8.2, the install went OK and I was able to boot into MD8.2. However, in mcc>Hardware my Promise card was listed under Unknown Devices. After running for a couple hours, system performance would seriously degrade often times taking several minutes to launch an application. I could find no running process using ps auxww to account for this. My theory was that the Promise card, being a DMA device with direct access to system memory, was somehow screwing things up. I never pursued this because everything works fine in MD 9.0.