Summary: Very pleased with this. It is quite expensive but you get what you pay for. Very high spec hardware makes this one of the fastest consumer NAS boxes out there. I installed 4 Seagate NAS drives (the excellent ST2000VN000) in X-RAID 2 (RAID-5). It has performed flawlessly since. It is almost silent in operation, even under full load. The system fan has not gone above 810rpm. Very solidly constructed with very easy to use tooless hard drive installation.