Bests & Worsts Reviews from Amazon

This mouse fits perfectly in my medium sized hands. The problem I have is how slippery this mouse is. If I relax my hand, then it slides down the mouse so that my third and pinky finger slide against the mouse pad. There are only two ways for me to use this mouse comfortably: 1. Claw grip: my preference for mice has always been a palm grip because it feels natural. But as I explained above, the mouse is slippery. To get around this I have to claw the mouse and even then I still have to hold my wrist in an unnatural position. 2. Double up: I have always used one finger on the left clicker and one on the right. But to prevent my fingers from hanging off the edge of the mouse I have to rest two fingers on the left clicker. This method is more comfortable but I do find myself accidentally right clicking when I try to use the scroll wheel (maybe I'll get used to it). All in all, the mouse works great but the lack of a pinky rest, along with the point near the dpi button, makes using the mouse uncomfortable. One final note: the mouse has a convenient slot underneath, so you can store the usb dongle. UPDATE & COMPARISON: I added one star for the awesome customer service. A few days after I wrote my review I was contacted by customer service and they offered to let me try the new model (Wireless Mouse, Anker Ergonomic USB 2.4G Wireless Vertical Mouse with 3 Adjustable DPI Levels 800 / 1200 / 1600 and Side Controls, Black). There are some differences/similarities between the two which I will list below. 1. Left/Right Click: The new model requires slightly less force to click - likely because it isn't as "vertical" as the older model - but the difference is really insignificant. 2. Scroll Wheel: I'm tempted to say that both models have the exact same scroll wheel with different mounting, and there is one minor as well as one huge difference. The minor difference is that on the new model the wheel is sunken deeper into the mouse than the old model (this can be seen in the pictures I've uploaded). The huge difference is that the scroll wheel on the old model requires a lot more force to click compared to the new model. Using the old model I often found myself missing or accidentally scrolling when I tried to press the scroll wheel, but on the new model it's very natural. 3. DPI Switch: For both placement and button quality, the old model surpasses the new model. On the old model, using the DPI only requires you to slide your thumb up (and the button is impossible to miss), while the new model is a tiny button behind scroll wheel. This shouldn't be a problem unless you're constantly using the switch. 4. Forward/Back Buttons: These are completely different on the two devices. In terms of responsive they are, the buttons on the new model can't even be compared to the old model. It only takes a very light pressure to use them - it's so easy you can click the forward button with the tip of your thumb and the back button with your inner thumb knuckle without even trying. On the other hand, the new model requires more force but it isn't "too much" force, so you don't have to mind the buttons if your thumb is resting on them and you don't have to try too hard to press them. ** This may just be the item that I received so I've "starred" this difference. The back button on the new model feels flimsy and ready to break. It feels like there is some kind of spring pushing up on the button, but that spring is off center such that one side can be depressed much further than the other. This gives the button a "cheap" feeling. 5. Shape: As someone who'd much rather rest their hand on their mouse as opposed to holding their hand in a certain position, the new model's shape dominates the old model's. Honestly, it's because the new model doesn't have the pointy edge. Without the pointy edge there are much more ways to hold the mouse so it's easy to find a comfortable position. That being said, the new model is also slippery and doesn't have a pinky rest (disappointing), but it's still much more comfortable than the old model. 6: Size: The mice are roughly the same size, but because of their shapes, the new model "feels" smaller in my hand. UPDATE #2: I ordered the first mouse on December 3, 2016 and I'm not sure when I received the replacement. As of today (05/07/2018) my scroll wheel has officially stopped working. I'll scroll down and it moves down a few units, then back up a few units. Everything else works great, but without a scroll wheel it's useless for me. That being said, the lifespan of this mouse seems to be just over a year.