This was beyond my expectation that within 6 months this mouse will give up its functionalities - that too when the product is from Logitech. Let me sum it up for you:
Good: - Light weight - Easy to hold - Looks & feels slim
Bad: - The scrolling mechanism failed within 4-5 months (its 6 months running & I am UNABLE to use the scrolling wheel any longer - as it behaves on its own mind)
Conclusion: - At this price there are other brands available - which will work flawlessly for >6 months at least. - And if you need peace of mind, rather add a few extra bucks and buy the higher models (which are proven over time) - This won't be a wise purchase as it seems more like a hit or miss case. Why take that chance?