It's fairly easy to use, yes, but I would have recommended other carts before it. The DS-X is rather expensive for what it does, and it only gives you a set amount of space. A device like the R4 or Supercard DS will let you use microSD cards so you can cheaply expand your capacity.
Regardless, you should be fine with it anyway.
There is NDSmail, but I don't know if it's been recompiled with the latest homebrew Wifi library, and therefore it might not work on your DS Lite.
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