Is this company comparable to Sandisk,Kingston, Samsung,etc?

[thailen]

Netac 500GB 250G SSD SATA III 3 Hard Drive 2.5" SSD Hdd Internal Solid State Disk High Speed​

 

[Grebuloner]

No. It's a low end Chinese manufacturer of electronics and seeing as how they won't disclose the controller or NAND used when asked, there's no telling what you're actually getting. The other brands you listed have higher quality, well-known offerings (add Crucial/Micron and Team to that list) and are available for about the same price. (Samsung is more expensive but generally makes a high-end product).