Ironically
I've just switched 3 satabeast2 units OFF for the last time.
I've got Netapps, Beasts and Xyratech sumos. The Nexsans were the best of the lot (really good rails, unlike the Xyratechs, and the Netapps just feel flimsy/gimmicky.
The writing's on the wall though - For the price of drives certified to go into these things, Samsung's enterprise SATA/SAS drives are only a small bump up in price - and the bottleneck in ALL of these dedicated raid units is the raid controller, not the drives, with the laughable ram cache in them not helping (yes, I know Netapps have ssd caching. I've got it, it doesn't help that much)
For that reason the latest bulk storage purchase was a TrueNAS Z30 with 60-drive JBOD drawer under it (again, one with good quality rails AND it comes with decent cabling arms) running ZFS. With just under 1TB SSD read cache, 128Gb of ram cache in front of that holding the filesystem metadata and ZFS is handled in CPU (much more power than any raid controller), it's at _least_ 20 times faster than the Beast-based server it replaced in terms of IOPS and 2-5 times faster in sequential access. (1TB no-change incremental backups now finish in 1-2 minutes instead of 12 hours and 1TB full backups in 5-6 hours on a fileserver being accessed by over 100 clients, without the users noticing). For the critical-IO filesystems we run a few TB of pure-ssd storage on the same box and _nothing_ I have thrown at it so far can make that pool sweat.
I fully expect the next storage system will be pure flash. Large SSD prices are on-track to be cheaper than HDDs within 18 months and once they hit twice the price of consumer-grade drives the market for spinners will collapse. It pretty much already has for everything smaller than 512GB.