Apparently, rumble does matter to a lot of Americans. According to SCEA, the feedback-giving DualShock 3 had $10.9 million [£5.57m] in sales during the month of April, meaning that about 200,000 Americans were ready to put down $55 [£28] for some vibration from their PS3 controller.
As we learned from our initial impression of the DualShock 3: Yes, it's worth it. We do know that the Sixaxis is on its way out, but at this point only the MGS bundles come with the DS3. We're still waiting for the "official" changeover to occur with regular PS3 consoles.