Not sure, whats so great about those cables ? I bought a few from KMD which have locking clip, are UV Blue (no idea what it means) and one of them has a right-angled clip.
I think some are costly becoz they use gold-plated/copper or good quality wires (similar to what they say in HDMI cables). The cheaper ones may be using ordinary conducting material, hence cheap.
I think one should not gamble with Data by using a cheap SATA2 cable. Data is more important, if you need to store it properly.
Normal ones are as good as these. BTW buy your SATA cables as short as u can get. Turns out they are very poorly shielded. Here’ the link for further reading ATA-ATAPI.COM – Serial ATA (SATA) Shorter length means minimum cross talk
Only invest if they have latching clip or are right angles ones (guess useful if u have diff hard disk orientation) & even these kind are available cheap in the market these days.
Also never tie them up together or with other power/PATA cables. I did that before & it gave me disk/controller errors:(. Also dont bend them