The R4 and DSTT are good if you just want to play backups of NDS games, the M3 is pretty much the same as these.
Personally i went for thr R4 as the UI is far superior to the DSTT, again the M3 is pretty much an R4.
If your in the uk then buy an R4 from www.gizmo24.com, they sell authentic ones and are 100% reliable for fast delivery.
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