Lots of bad reviews is it as good as people say?

I'm using two of these Startech USB 3.1's at the same time with 16TB and 18TB HDDs in them for a total of 4 drives without any problems.

I have a HD with unreparable bad sectors but still running. If I want to replace the HD, is this the best way to go? No need to by new OS?

If by unrepairable you mean SMART Current Pending Sector then offline duplication is NOT recommended. Tested on SDOCK2U33RE with a 1.5TB drive w/ 6 reported errors the duplication was still at 0% after 24 hours. Also be advised this model is NOT capable of retrieving SMART data over USB (newer chipset than older models). You're going to have to use ddrescue or such.

Can I use as docking station

I had the same question. Yes, it can be used as a dock, both bays functioning at the same time with hard drives in each bay. But be advised that this unit cannot actually achieve the advertised 10Gbps speeds -- even if using 2 SSDs in RAID 0 -- because this unit only has a single SATA III controller for both drive bays, which caps the total access speed at 6Gbps.

Can I clone a Samsung 970 evo to any other m2 ssd (intel, hp, ect)?

No, SDOCK2U313R supports 2.5" & 3.5" SATA SSD/HDD drives not NVMe based SSDs such as the Samsung 970 Evo. Atha, StarTech.com Support

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Description

🚀 Clone Like a Pro, Work Like a Boss

BLAZING FAST USB 3 2 GEN 2 - Experience ultra-high-speed data transfer at 10 Gbps for seamless cloning and docking.
IT PRO TRUSTED SUPPORTED - Backed by 2 years warranty plus free lifetime 24/5 multilingual tech support—because downtime isn’t an option.
SECTOR BY SECTOR PRECISION - Clone every byte, including empty sectors, ensuring exact drive replicas at up to 28 GB/min.
TOOL LESS TRAY LESS DESIGN - Top-loading 'toaster style' bays with easy eject buttons for effortless drive swapping.
TRUE STANDALONE CLONING POWER - Duplicate 2.5" & 3.5" SATA HDDs/SSDs without a computer—perfect for on-the-go IT pros.

The StarTech.com SDOCK2U313R is a dual-bay SATA HDD/SSD duplicator and docking station that delivers blazing 10 Gbps USB 3.2 Gen 2 speeds. Designed for IT professionals, it offers standalone sector-by-sector cloning without a PC, supports all SATA drive sizes and formats, and features a tool-less, tray-less top-loading design. With 2 years warranty and lifetime tech support, it’s the ultimate solution for fast, reliable drive duplication and access.

Specifications

Material	Plastic
Item weight	0.51 Kilograms
Memory storage capacity	28 GB
Compatible devices	Desktops, Laptops, Tablets, Smartphones
Hard disk form factor	3.5 Inches
Max number of supported devices	2
Data transfer rate	1E+10 Bits Per Second
Global Trade Identification Number	00065030863551
Manufacturer	StarTech.com
UPC	065030863551
Product Dimensions	14.22 x 13.21 x 7.11 cm; 508 g
Item model number	SDOCK2U313R
Series	USB 3.1 Duplicator Docking Station
Color	Black
Form Factor	3.5-inch
Processor Count	1
Hard Drive Size	6 TB
Hard Disk Description	HDD and SSD
Hard Drive Interface	USB 3.2
Number of USB 3.0 Ports	1
Voltage	12 Volts
Wattage	36 watts
Power Source	AC Adapter Included
Operating System	OS independent; No software or drivers required
Are Batteries Included	No
Item Weight	508 g

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