You could go with the ARM version of the Netgear
for about half the cost.
Though the user interface isn't quite as polished as the more expensive and favored Synology NASes, for example, these newish Netgear ARM platform NASes are pretty good bang for the buck. I have the 4-bay version (ReadyNAS NV+ V2) that I was able to pickup for $300, minus a $100 mail in rebate promotion that Netgear had going last summer. It has performed pretty well, and comes with USB 3.0 and, due to the ARM platform, very good transfer speeds (like 25 MBytes/s to 90+ MBytes/s) (the large range for the 4-bay version is due to variation in transfer speed by RAID array type and number of disk - 3 disks in RAID 5 being the slowest). FYI, this review reports
50 Mbytes/s writes and 100 Mbytes/s reads for the 2-bay version with 2, 1TB disks in RAID 1.
The only reason why you'd need a faster platform for a simple home NAS would be if time rebuilding arrays in event of failure is critical for you.
The only issue I've had over the past 6 months with my 4-bay unit is 2 random disk failures on the same disk (I have 3, 2TB Seagate Barracudas (st2000dm001 in RAID 5). But removing the disk, powering down, inserting the same disk and letting it rebuild the array overnight has worked both times. I have no idea if the issue is due to the disk or the NAS, but those Seagates aren't known for the best reliability...