Quite an amazing piece of hardware/software. Today my M3 simply arrived at my door, it was probably the highlight of my week. I was able to play ds backup games to my heart content. I instantly tried all the games I owned (Castlevania, Mario Kart DS, Animal Crossing, New Super Mario Bros) and they all worked perfectly. It was simply amazing. I was captivated by the homebrew stuff too, in particular DS Organise, though i hardly use it, its quite a nifty tool and all.
I immediately started skinning my ds to a nicer looking skin (iphone looking one) and tried a few videos. Everything worked, the music was nice and video on it was disturbingly cool haha.
A quick video demonstration can be seen below