All four NAS products offer the essential features necessary to provide large amounts of storage to smaller organizations or workgroups. You could use 4TB drives to get 48TB of raw space if that's what you need. Most likely the decision will be driven mainly by available features such as cloud connectivity or virtualization support. Performance across the various products wasn't all that different, though the LenovoEMC and Netgear systems pushed more IOPS and the Infortrend and Netgear boxes suffered the highest latencies.
The difference in base cost is significant from low to high, but you get more features and better performance with the more expensive units. The QNAP TS-1279U-RP offers the most options and extras, while the LenovoEMC px12-450r offers stronger performance and the most cloud storage options. Overall, the Netgear ReadyNAS 4200 offers the best combination of performance, features, and polish.
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