A:Answer Yes. Class 10 is a higher speed rating, but it is backwards compatible. You just won't get the read/write times advertised for the class 10 product, you'll get the slower class 6 bandwidth instead.
In general, I buy the highest speed flash cards available, on the theory that I'll have the card a lot longer than the device, and I don't want to have to buy a new card when I buy a new device.