57USD, not worth it. Max 15USD.

Yep, way too overpriced imho. 57USD is simply too much. Few years ago for that rig in my sig (X58 mobo without SATA3, just SATA2) to use it with Intel 520 series 120GB SSD as it's meant to be on SATA3 I've bought Transcent PCIEx 2.0 x4 combo SATA3/USB3.0 controler card for just around 20€. If the price is 20$/€, even 25$/€ that would be OK, but 57$ is way too much. btw, cards like this OWC Accelsior S (for fair price, of course) could be really nice upgrade for all running SATA3 SSD's on non-SATA3 mobo's.

Looks like they used a run of the mill multipurpose USB/SATA/PCI-E controller, slapped on a cheap PCB. Better save some extra cash and go for a true native SATA-6G with a new (or second hand) mobo. Those auxiliary controllers usually suck at write speeds anyway.

what if you bought a pci-e ssd instead?

Definitely not worth it. I bought a PCIe card with 2 SATA ports (with RAID support) for about $20 including shipping. I'm guessing its performance isn't up-to-par but it has so far been good enough. Considering this card is marketed toward people who are looking to add a SATA3 SSD to a PC that currently does not support SATA3, it makes more sense to me to just simply get a PCIe SSD and skip SATA altogether.