I am not a big fan of the reflections that are used frequently in "web 2.0" logos and PowerPoint graphics. The fact that PowerPoint enables a feature does not mean that you have to use it. As an example see a logo that Visa uses to build a relationship with small business customers.
- Both logos would look much nicer/cleaner without the reflection
- In the left image the reflection is not correct, the 3D compartment of your brain tells you "something's not right here". I am sure it was not the intention of the designer to create a logo in the style of Escher.