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

⚡ Double your storage hustle with speed and style!

BLAZING FAST TRANSFERS - Experience ultra-high 10 Gbps USB 3.1 speeds for lightning-quick data duplication and backup.
PLUG PLAY SIMPLICITY - No batteries or complex setup needed—just connect and start duplicating instantly.
DUAL DRIVE COMPATIBILITY - Seamlessly duplicate or access two 2.5" or 3.5" HDDs simultaneously—perfect for multitasking pros.
COMPACT PORTABLE DESIGN - Lightweight 508g and sleek form factor fits effortlessly on any desk or workspace.
POWER EFFICIENT PERFORMANCE - Optimized 36W power consumption keeps your workflow green without sacrificing speed.

The USB 3.1 HDD Duplicator Dock (SDOCK2U313R) by StarTech.com is a compact, dual-drive duplicator supporting both 2.5" and 3.5" hard drives. With blazing 10 Gbps USB 3.1 transfer speeds and a power-efficient 36W design, it enables fast, reliable data duplication and backup for desktops and laptops alike.

Specifications

Item Weight	0.51 Kilograms
Memory Storage Capacity	28 GB
Compatible Devices	Desktop, Laptop, Personal Computer
Hard Disk Form Factor	2.5 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
Form Factor	2.5-inch, 3.5-inch
Item Height	2.8 Inches
Item Width	5.2 Inches
Product Dimensions	14.22 x 13.21 x 7.11 cm; 508 g
Item model number	SDOCK2U313R
Processor Count	1
Voltage	12 Volts
Wattage	36 Watts
Are Batteries Included	No
Item Weight	508 g

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