Very correct

The pros:

- Design.
- Quality manufacturing / finishing.
- More than ball that gets dirty (like the mighty mouse)
- Integration with Mac OS X perfect (10.5.8 minimum required)
- Sensitivity of effective touch surface.
- Works on (almost) any type of support (but not on glass surfaces etc ...)
- Laser Technology (and not optical) for guiding = more accurate.
- Scrolling performance.
- Possibility to extend the multi-touch functions by third party software ([...] [...] or [...]) After trying these three solutions to extend the multi-touch capabilities, the solution proposed by [...] is for me the best, not by its setting interface (in English as well), but rather due to its almost perfect operation compared to others that one can shambles. )
- Scrolling silent, with over ball or wheel (useful if you are open working environment, the neighbors are quiet)
- Can be used on PCs (look for drivers on the net) and in a BootCamp partition under Win.

The -:

- A little heavy (even if it is lighter than the mighty mouse without son)
- Power consumption can a high.
- Do not yet exist in wired version
- Too flat, taken in hand in the long tiring.
- Stop a can too bright, can be unpleasant.
- The pads underneath cling too, that not slide enough.
- Multi-touch function very limited original (but it has the merit of work well)
- Originally, the pointer speed is still slow, even thoroughly. To overcome it, install (for example): MZoom: [...])

In conclusion, this is a rather successful mouse. The big advantage is the total absence ball, so no clogging.
I wish I could find the wired version to make it lighter and consumes less battery.
Must not agree to the pros or large users because ergonomics is not great (too thin and too heavy).

This said, I do not regret my purchase.