It seems that many of them just don't understand how difficult it is to transfer all data from Joomla! 1.5 to Joomla! 2.5.
In my opinion this extension manage this task perfectly.
Of course if you are expecting to have all data, extensions and templates transferred with just a one click, you may be disappointed.
But if it is clear for you that it needs a bit more work than one or two clicks, you'll be happy with this extension.
I think we should be very thankful for all the hard work Matias put in this component.