The only down side is the X2 comes with a price premium, but over time we do look for the price to go down as all computer parts do. Our 240GB RevoDrive X2 is available at Newegg now for 679.00 USD. At the time of writing four 60GB Vertex 2 drives would cost you around 536 USD at Newegg, but then you need to either use an additional controller, the Intel ICH which would easily be saturated by just three drives and then have to worry about cluttering your system up with all of the cables required to get the RAID array up and running. I think most users would opt for the X2 and leave the case clutter to someone else. This option also aids in airflow to the other components that enthusiasts will more than likely have overclocked, so the benefits are more than just what shows up on the benchmarks and specifications lists.
One area that we will have to look for over time is how the RevoDrive X2 performs after long term use. There is still not a way to run TRIM in RAID, but the SandForce controllers are very resilient to ‘SSD fragmentation’.
I wouldn’t hesitate to use the OCZ RevoDrive X2 in my own system and our sample X2 is going to quickly disappear from the inventory list since I am starting my SR2 build this week. With all of the SSD drives we have on hand I will be using the RevoDrive X2 for my OS.