Does anyone know whether the class / speed of a Micro SD card has any impact / performance when in use with a DAP? I've previously used the Sandisk Extreme's. I'm looking to get a 1TB card but don't know if the price difference is worth it compared to some of the non-pro cards etc. I'm assuming...

Hey all, I upgraded to the Fitears from Westone 4R's a year ago..and i'm really struggling. I know these are very highly rated and well loved by enthusiasts, but there's something about these little monsters that I just cant seem to like. The instrument separation is second to now...