Habey DS-1280 12 3.5" Drive Bays One 12.0 Gbps Mini SAS (SFF 8088) connector 3U 12-bay SAS Expander Direct Attached SAS/SATA JBOD Storage Array

Pros: - Holds a lot of drives
- quiet relative to machine room storage, maybe quiet enough for a non-bedroom closet
- using a 3ware 9690SA I was able to benchmark about 300MB/sec sequential using 11 Samsung identical enterprise grade drives with CrystalDisk x64

Cons: - too loud for a living or home entertainment environment
no drive failure lights, no SGPIO, no raid native enclosure support
- SAS expander scheme is all wrong. of the 4 SATA 3.0Gb channels going into the device, 2 get wasted on one drive per channel. Then the remaining 2 SATA channels get divided between the remaining 10 drive bays. Do a little math and you get theoretical max 600Mbit/s per drive of those ten. Divide by 8bits per byte, and you're at about 75MB/sec max speed per drive on those 10 expanded drives. modern SATA2 and SATA3 drives can run at 110-150MB/sec, so you're just throwing bandwidth in the garbage.

Other Thoughts: I can totally imagine that this device has a purpose. I'm just not sure what that purpose would be. 12 drives is getting high for "guess which serial number to pull" failures. It really needs enclosure support to identify failed drives.
Home Media enthusiasts beware this is not for you. Get a synology diskstation or something that actually has a brain and can deal with consumer grade drives. This devices should be used with a real raid card and therefore enterprise grade drives.
If I had to guess who would be able to find a use for this, maybe security camera recording on the cheap? cheap HBA+linux might = stable soft raid with consumer drives?
HBA+freeNas might = win
It really is the bizarre case of a product without a purpose.

my raid dropped a lot of drives but I can't tell if it was the Raid card or the enclosure

Pros: Price, quality, ease of using hot swap bays, works great with my Mac Pro

Cons: No SAS Out SPF-8088 connector

Other Thoughts: This was the only SAS expander I could afford that met my requirements, and it met them with flying colors. I wouldn't hesitate to recommend it to others.

Pros: Added 12 Samsung 2Tbs for 24Tb and hooked this into an Areca ARC-1680X and it worked great. Speed is great and have had zero problems.

Cons: n/a

Pros: Nicely made, Smooth edges. Drive trays slid into place with minimal effort. Pretty quite fully populated.

Cons: None as yet

Other Thoughts: I used an Areca ARC-1680x controller with a single SFF-8088 cable. All 12 drives showed up and intialized. Will test throughput once everything settles.