After extensive testing and upgrading to Snow Leopard 10.6.1, the HighPoint RocketRaid 3510 has lived up to my expectations. It just sits there in the background working away without any problems and when it comes to speed, it certainly cuts the mustard compared to the original Apple RaidCard I used to have.
Here are the results using QuickBench 4:
XBench 1.8:
That makes for one very happy camper! :-)