This card is not 133x (Class 20). It is Class 4 at best. Now I see how they can sell it so cheap.
I suspected something was wrong at first when I was recording paltry 640x480 video on my Canon 5D.. This is a 2MB/s task.. I got the little 'buffer filling' warning on the right hand side of the display, indicating the card was not keeping up with the bit stream! What the heck!? This is ridiculous for x480. A good rule of thumb for compressed video is 2Mb/s for 480P, 4Mb/s for 720P, 8Mb/s for 1080P. Find those numbers any number of places. 133x should give me 20MB/s+
So, sick that I had just wasted my money, I plugged the CF to my PC and ran CrystalDiskMark with a 50MB file size, representative of a RAW+JPEG write. To my shock and horror, the card is a CLASS 4! (26x). Ran it again simulating a video stream, same result. Now I understood why the card could not keep up with my Canon DSLR.
I posted the picture proof in the 'customer images' go check it out. If you have an older camera or only need x480 this card would work; but will you patronize a company that lies to you?
Unfortunately, shipping is more than the cost of the card; I'll keep this as an emergency backup for when I forget my quality card.