It does a good job at merging cells and gives useful options for doing so.
But it seems to clear the whole undo stack for the sheet it's used on!! So if I choose to merge columns B, C, and D but make a mistake when doing so, there is NO UNDO. And previous states of the sheet are also lost.
I'd love to be able to use this but can't considering that limitation.
And a reply to the previous reviewer: You can split data into cells with the Excel function 'Text to Columns,' location in the Data Tools section of the Data tab.