Don't over-praise Logitech though, they do make mistakes. I just changed a great wired Logitech mouse (wires do break near plugs sooner or later) to a really nice wireless one (M525). It's almost great, but the click-wheel is near unusable, simply because it's tiltable. Every third click or so causes an unwanted tilt. Worst case - using a browser in windows. Usually I want to open a link in a new tab (typical for my mode of browsing) and end up going back in history for that page, with a bit of luck also opening the link, but that's not guaranteed, depends on the sequence of tilt and click. This "back" behavior seems hardcoded. Even a single checkbox in the driver to say "on tilt do NOTHING" would solve the issue.
Tiltable clickwheels are not a very good idea. Tiltable clickwheels requiring little force to tilt are simply dumb. Tiltable wheels not easily controlled from the driver's setup window are evil.
I actually have a brand new, not-so-cheap mouse, with no malfunctions at all, great sensors, good overall ergonomics... and I'm actively looking for a good replacement, just because of that wheel. Bad, bad design.