Unfortunately, the 1000x is a bit slower in the Schreibgschwindigleit than 600x.
My benchmark in MB / sec, USB3.0:
________ | Schr |. Read
600x____ | 65 _ | _ 111
1000x___ | 51 _ | _ 114
The 1000x is indeed read slightly faster when, but it comes with a digital camera on the writing speed and is much slower!
Furthermore, the customer will be tricked again, the 1000x also suggest that you get a little faster than 600x, something that ought to be nearly twice as fast!
Conclusion: Buy the 600x, since access faster or deeper into their pockets and buy something really faster from competitors.
The card makes otherwise a good impression but because of the deception I subtract two stars!