Summary: Great device; wish it were closer to level (it tilts forward quite a lot). I also keep accidentally pressing the "back" button when I'm just resting my hand on the case. Stiffer buttons (or a better arrangement) would be nice.
Summary: It basically works like a trackball should, and the twist-to-scroll feature is very intuitive - it's like twisting a volume knob. The control panel applet works nicely. Hardware companies generally struggle to write usable software, so that was a nice surprise.
Summary: This was my first Trackball from Kensington, as I have been using the Logitech M570 for a long long time. The fit and finish of this device is very well done. I love the feel of the trackball, the scroll function, and the placement of the buttons.
Summary: I upgraded from the Kensington Expert Mouse Optical USB Trackball and couldn't be happier. I find the Slimblade more comfortable and easier to use. The rotating marble is a much better solution than the ring on the Expert. Aesthetically, it makes the Expert look very dated.
Summary: I could not find a suitable thumb trackball to replace a Logitech M570 that thought it knew better than I did when to double click or end a drag-drop operation, so I reluctantly settled on this. I'm pleased to say my reluctance was ill-founded: There's a lot to like about the Kensington SlimBlade.
Summary: This is a smooth operating Kensington trackball. Build quality seems up to Kensington standards. I replaced a Kensington expert trackball with the scroll ring. Personally, I don't see that scrolling with the ball is any advance over the ring; in fact, I rather prefer the ring.