Yes, mostly used units from eBay. Low cost, great performance and reliability. You'll need to make sure you have proper supporting infrastructure as they don't

Yes, mostly used units from eBay. Low cost, great performance and reliability. You'll need to make sure you have proper supporting infrastructure as they don't come in standard closed self-supporting enclosures. If you are single-system deployments they don't make much sense, but then again, neither would other rack-mounted systems.