too small for what it is.
I have both this product, and the original GBA cart sized Rumble Pak and a DS Lite. When using the DS Lite Vibration Cartridge in a DS Lite system, it was about as useful a the DS Rumble Pak in the old DS. Near worthless. But using the GBA cart sized Rumble Pak in the DS Lite, one actually gets some decent rumble. I say if ya got a DS Lite, just get the DS Vibration Cartridge/Rumble Pak. Sometimes bigger is better.

S'aight
Not entirely pointless, but its still a pretty good product. If you have games like Star Fox Assult, Metroid Prime Hunters and Mario and Luigi: Partners in Time, this device is not a MUST HAVE but just a novelty item.

So pointless.
I bought it for EBA, assuming that some of my other games would support it too. God, I was wrong. I've got 12 games and EBA is the only one. Still, it makes the game heaps cooler to play, and the noise isn't too bad. I'd have given it 4 or 5 if more games utilized it.

Worth The Loot
Must Get!!! Super Fun with all vibe games

I didn't like it so much...
I bought this with Super Princess Peach (wich makes use of the rumble feature) hoping on getting a great device. But I didn't like it so much because I't hardly vibrates...seriously...I almost can't feel the rumble somethimes...and I prefered to play Super Princess Peach without this, because it also makes too much noise. Actually, as many people say, it makes more noise than it rumbles. Of course it fits perfectly on the DS Lite and all, but for the price, you bet go spend the money on a game or some better accessory for de Lite, such as the Browser or the Wi-fi Connector. If it was a bit cheaper, then MAYBE it'd be worth it. Ohhh...and before I forget it: why didn't they put the rumble feature on Mario Kart DS?! That would be SOOOO perfect...I love the game so much that i'd buy the rumble pack only for that, even having to get accostumated to the highly annoyng noise it makes.