Hello, I've read that the micro sd on the Hero is in constant use and is one of the bottlenecks which contributes to the speed (or lag) which affects the handset. As such installing a Micro SD capable of higher transfer speeds is rumoured to improve the performance of the phone. I'm considering buying a class 6 card but they're more expensive than slower cards so I'm loath to do if there's going to be no improvement. Has anyone replaced their card with a faster card? Did it make a difference?