I do not have any benchmarks. These are on production systems. One thing I can say is that initializing a RAID 5 on the promise with 3 80GB HD's took almost a full day. On the 3ware it took less than 30 minutes. The 3ware is also better supported across multiple OS's. Win Server 2003, FreeBSD 4.x and 5.x, along with Linux will all see the 3ware with default drivers. Not true for the Promise.