Julianne Pepitone for CNN Money:

Apple unleashed the original iPad two years ago, selling millions and silencing tablet-market naysayers. As Apple prepares to unveil the third version of its tablet on Wednesday, its rivals are still stuck at the starting line.

Just last month, Samsung’s head of product strategy admitted they’re “not doing very well in the tablet market.” Now companies are trying to blur the lines with “phablets” – devices that are too large to be conventional cell phones, too small to replace the iPad. Everyone’s looking for a way to knock Apple out of the top spot, but no one has succeeded yet.