When comparing Kensington Expert Mouse vs Thermaltake Ventus X 2015, the Slant community recommends Kensington Expert Mouse for most people. In the question“What is the best gaming mouse?” Kensington Expert Mouse is ranked 55th while Thermaltake Ventus X 2015 is ranked 88th. The most important reason people chose Kensington Expert Mouse is:
With thumb and pinky on the buttons and three fingers controlling the ball, the user's wrist lays flat on the table (or on the provided attachable wrist rest).
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro Comfortable and ergonomic
With thumb and pinky on the buttons and three fingers controlling the ball, the user's wrist lays flat on the table (or on the provided attachable wrist rest).

Pro Intuitive link between ball motion and FPS camera angle
The ball is large enough for turning it to feel like physically rotating an object.

Pro Fast response, fast tracking
With a 5700 DPI and a polling rate that ranges from 125-1000 the Thermaltake Ventus X 2015 allows for accurate tracking and response time. Making for a good mouse to use in first person shooters as well as daily activities.
Pro Ergonomic
The ergonomic right handed design allows for a comfortable palm grip to be used with the device.
Pro Adjustable weight
There are extra weights that users can place into the device to customize the weight of the device.
Cons
Con Not a mouse
This is a trackball, not a mouse.

Con Questionable secondary button defaults
The upper left button, which is the hardest to use, is middle click by default. The upper right, which the ring finger naturally rests near, defaults to Back. This can be particularly annoying as the Back button is easy to brush when moving hands between keyboard and mouse.
Con Stiff scroll wheel
The scroll wheel tends to be a bit stiff which may cause inaccurate scrolls.
