I have recently purchased a Pegasus Promise R4 with SSD replacements for the 1TB Hitachi HDs installed by the OEM. The SSDs are 160GB, SATA II (3Gbps), Intel 320 Series. I read on another mac site, I think it was "NuFunk" or something, that they recommended only using 6Gbps SSDs if you were going to try placing SSDs in the Pegasus Promise. They also said there are problems in general with the SSDs working with the Pegasus Promise. I would like to know if anyone has tried this already what their results were. I will report mine once I am up and running. I am using the RAID to support storage on a Mac Mini I am peicing together. Interestingly, I will be replacing the 2011 Mac Mini's two 500GB HDs with one Intel 520 Series (6Gbps) 250GB SSD and one Intel 510 Series (6Gbps) 120GB SSD. I will also be installing 16GB of Corsair (Mac specific) RAM. I may discuss the outcome of the Mac Mini in a separate post, as I gather it belongs their by organization. If anyone has tried using SSDs in Pegasus Promise, I would like to know how successful it was. Thanks.