First steps with WiFly and Arduino

Hi

Sorry to ask again but I want to be sure before I purchase and I've discovered there seem to be an enormous variety of usb/ttl adaptors.

I've found a 5V adaptor here:
http://robosavvy.com/store/product_info.php/manufacturers_id/33/products_id/986
which is cheaper than all the usb to ttl cables I've seen (I have a usb male to female extension already). It looks the same to me but the (CP210) number is not one I'm seeing anywhere else. Maybe its just the brand id number?

and I've found a tutorial here:

which is nice and clear - even though the adaptor is different, same principle right?

thanks in advance
Garrett