I have this unit, sitting in my server room. I purchased it for a Funny reason. It came with two power supplies which fit their servers also. This unit was sold brandnew for $299 at the time, while the PSU for the Lenovo servers were going for $449 each. I got this instead and pulled the PSUs. I did play with it, it takes the SAS/SATA drives, you just to get the Lenovo Trays, you also need the HP 2.5 adapters that will make 2.5 work in this unit. I also tested with LSI card and make a raid 10 with ssd caching enabled (cachecaid) It did work great.
Heres the original Lenovo trays (I highly recommend these vs the oem, the oems work but the led lights never show correctly so you cant let if the drive is on or dead.
Original Lenovo RD330 RD630 3.5" HDD Tray Caddy 03X3969 31050780 RD530 RD430
This is the adapters you need to make ssds 2.5 to work in enclosure
hp 654540-001 2.5" SAS/SATA/SSD to 3.5" Drive Adapter FOR 651314-001 F238F tray