I use a SlimBlade at work, and have not had that problem. If you find it difficult to depress that large, flat button, try something with a different click mech

I use a SlimBlade at work, and have not had that problem. If you find it difficult to depress that large, flat button, try something with a different click mechanism. I use an Elecom Huge at home, another mouse with an oversized trackball. I use it for work and gaming, and find it very snappy to operate. The left-click is clicked inwards with your thumb, instead of downwards like the Kensington balls. Uses a different muscle. You might miss the ball-scrolling, but only the SlimBlade has that mechanism.