The rumble feature of the SCR series is a joke. It only works on the Metroid Pinball rom as far as I know, which you must patch with a special patch file before using. And then it only rumbles when you press a button, not when the game would normally rumble. So yeah, don't buy it for that.
If you're interested in getting an EZ Flash V, they have recently introduced a slot-2, 3-in-1 addon that has support for GBA binaries, official game rumble, and Opera browser support. You must use it with the slot-1 EZ Flash 5 though.
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