For me the big advantage of Apple's trackpads is their size. More surface area equals less finger repositioning and more reasonable tracking/acceleration speeds

For me the big advantage of Apple's trackpads is their size. More surface area equals less finger repositioning and more reasonable tracking/acceleration speeds. I bought a Waccom Bamboo, wired not wireless, for $99 so I don't think Apple's $70 price tag is unreasonable.