Chip Magazine (www.chip.de) is a premier technology publication in Germany, and much of Europe for that matter. They recently completed a defrag head-to-head comparison of 6 various defragmenters, including the Windows Vista built-in product (which also happens to be very similar to Windows 7 built-in).

The timing worked out that we were able to submit Diskeeper 2010 beta software into their challenge.

And...

We're excited to announce Diskeeper took 1st place based on their rigorous technical testing process. Ausgezeichnet!

Here's a screen shot of the points awarded (only Diskeeper received the max 5) and placement of the entrants (only Diskeeper ranked in the top class). I removed the other product names to protect the "guilty" :-).

If you're a subscriber, you can read the whole 4 page review (in German mind you).