Pros: I have always used Logitech trackman/balls for more than 20 years.
Cons: the one before this one lasted for at least 5 years. this one only lasted 6 months. the left click button eith double clicks or does not hold when you are dragging something. I used canned air but it did not solve the problem. I am very disappointed given I have been using Logitech trackman/balls for so long. And no I did not abuse it! I am a baby boomer with an IT background.
Summary: bought this thinking I could still scroll by assigning one of the small buttons to scroll by holding it down, but it doesn't seem to allow that. I can assign right small button to scroll with ball but as clicking this button is very awkward I tried assigning left small button but it doesn't actually work for this function (SW bug). Also can't seem to find an easy method to zoom (really miss the wheel).
Summary: For quite a few years now I've had a trackball mouse on all my computers - the sort that has the buttons where your first two fingers can naturally lie on (and click) them, and where your thumb rests naturally on the ball. This seems the optimum ergonomic layout, to me anyway. So - apart from some daft idea about creating an 'ambidextrous' mouse - I've no idea why logitech dreamed up this ridiculous layout.
Summary: Its quite difficult to understand how Amazon can partner with a company who's customer support is so poor- I have received items that are not UK specifcation which I am now being asked to return at my cost to France! - And I cannot get a straight answer from Pixmania - have queued for 30 mins for customer support - TWICE. I got through to sales in 2 minutes - That says it all - I will never use them again EVER!
Summary: Ich benutze schon lange den wunderbaren alten Trackman Marble FX, dessen Treiberunterstützung für Windows 7 sehr zu wünschen lässt. Daher griff ich zum namentlichen Nachfolger. Ich war entsetzt. Der Versuch, den Ball des neuen "Marble Trackball" zu bedienen, führt zu Verrenkungen; versucht man dann zugleich, eine der Tasten zu drücken, ist ein Krampf vorprogrammiert. Mein Rat: Finger weg.