Logitech asks $70 for the Touch Mouse M600, a touch sensitive input device in the style of Apple's Magic Mouse and Microsoft's simply named Touch Mouse. That price will come down once the M600 hits wider distribution, but it's still in the same range as its competition. As much as I like the Touch Mouse M600's looks and its attempt to replicate smartphone-style touch input, it lacks the library of specialized gestures you get with the other touch mice. I don't necessarily miss those gestures, but with fewer features should come a lower price. That price discrepancy and the fact that touch input is basically a novelty here prevents me from recommending the M600 with any great enthusiasm.
"Scroll and swipe where you like," says the M600's product page. This, essentially, is the chief innovation brought about by Logitech's touch input efforts. Rather than face the burden of a mechanical scroll wheel or thumb-side back-and-forth buttons, Logitech's new, Windows 7-only mouse frees you to scroll down a Web page, or navigate back and forth, all by simply dragging your finger in the appropriate direction across the M600's shiny plastic surface.
There's nothing inherently wrong with using touch-based input for those navigational features, but it also doesn't add anything you can't get from a more affordable, mechanical mouse.
Typically touch mice have greater ambitions. Apple's Magic Mouse and its exceedingly uncomfortable shape supports the same language of swipe-based gestures Apple has built into its recent MacBook trackpads. As well, Microsoft's Touch Mouse has a more-or-less intuitive hierarchical input system, wherein you can navigate in and between different applications based on the number of fingers you use.
I'm not necessarily asking for Logitech to create a new mousing lexicon. Traditional mice work well enough that few users would bother to overcome an overly steep learning curve just for touch input. But if Logitech is going to boast "smooth-as-smartphone scrolling," what about adding some smartphone-style multitouch recognition? Can I get some pinch-to-zoom?