Shape

The shape of the Sensei 310 is very close to its well-known predecessors; however, slight changes were made to either improve handling or give it a visual edge. The main thing that caught my eye was the use of main buttons that are separate from the shell. This has been a good trend these last few years as the separation from the shell means that the resistance of the shell to bending has no influence on the button click's feel, and nor does it increase how much force is required. The clicks on the Sensei 310 hence feel improved compared to the older Sensei. They are not on the same level as the Logitech G303 with its spring-loaded buttons, but are very good nonetheless.

Weight: 96 g
Height: ~38 mm
Width: ~70 mm
Width at grip area: ~62 mm
Length: ~124 mm
Number of buttons: 8



In the pictures below, you can see how I hold the mouse, and the grip I use. This might give you an idea of whether the Sensei 310 also fits your needs when it comes to its shape.

Comparison

Here, you can see the new Sensei 310 right next to other popular ambi mice. Left to right, you see the Logitech G900, Zowie ZA11, Steelseries Sensei 310, Steelseries Sensei Raw Rubberized, and Dream Machines DM1 Pro S.


Here's a direct comparison of the new and old Sensei. Note the more pronounced edges at the back of the Sensei 310. I would think that these are mainly for aesthetic reasons. They didn't bother my hand, but I've heard other people saying they preferred the smooth back of the old Sensei, and I can see that being the case depending on your grip.

Actual Weight

Steelseries is listing the Sensei 310 as 92.1 g, which might be considered misleading if you put the whole mouse on the scale, but it's accurate if you completely unplug the cable and weigh the remaining parts. If you put the mouse on the scale with the cable suspended, it roughly weighs 96 g.


Here, you see the weight of the parts with the cable unplugged. In my experience, the weight is fine - the mouse is light enough for its size. I generally prefer mice to be as light as possible, but have no problems using the Sensei 310 for hours on end without any signs of fatigue.