SteelSeries Sensei Laser Gaming Mouse - Grey | High Precision, Ergonomic Design for PC & Mac | Perfect for FPS, MOBA & Esports Gaming

I've been looking for a good mouse for the past few weeks and decided upon the Sensei. Despite being two years old, it is still basically the best 9500 based mouse out there. Even though it is a laser sensor, the custom firmware SteelSeries developed makes acceleration almost non-existent. It isn't completely gone, though it's somewhere in the range of 1% or lower which is practically imperceptible. The ergonomics of this mouse are really good for being an ambidextrous design. I have normal average sized hands and never have a problem accidentally clicking side buttons. The weight is good, the balance from front to back is about even so sudden side flicks aren't either too sharp or dull since the mouse pivots naturally with your hand. The gliding pads are good, though I wish they were beveled, however no manufacturer does this so it's sort of a moot point. The cord is great, seems to be very high quality and the connector is gold or gold plated which is very nice. The main left and right switches are perfect. I can comfortably rest my fingers on them without activating them, though it doesn't require much pressure at all to press them. They have great feedback too, springy and loud but not overly so. I'm positive they're Omron switches though I don't believe the side switches are the same.Now for the bad stuff, or rather, misleading stuff. The advertisements on the box, website, literature, whatever all say the same thing but some of it isn't true. First and foremost, there are only a handful of colors that the built-in LED's can produce. The LED's are blue, red, yellow/orange, and green. They can go half intensity or full intensity and that sort of limits the colors available. They can basically only display primary, secondary, and some tertiary colors. In the software you can set any color you want, however the mouse LED's will just produce the closest color to one you chose out of the aforementioned color combinations. Not a big deal, I do like the "white" since it's a swirl of light blue and light purple--which looks especially striking on the SteelSeries logo on the back. Second, the sensor is capable of going to about 5700 CPI, however it does so in steps of 90. In the software, you are able to set the CPI in increments of 1 CPI, so I guess they are going to the closest natural CPI and interpolating up or down to get the desired CPI. Again, not a major issue, but a little misleading. Finally, the Sensei can store five profiles, each profile having two CPI settings. However, the first profile slot is reserved for an undefinable default profile. Again, not a major problem. I play two different genres of games as well as use this mouse for work and I still have an extra profile slot left.Now with those minor faults and with the mouse being two years old, I have one overwhelming reason to recommend this mouse: after you have your profiles customized, loaded, and stored on the mouse, you can uninstall the SteelSeries Engine and switch profiles using the LCD on the bottom of the mouse. This is a huge plus for anyone who has had to deal with Logitech's conflicting software, Razer's "cloud" software, or any of the other bloated and resource sucking manufacturer software packages out there. No driver crashes, no software freezes, no sudden resource usage spikes... I can confidently recommend this mouse if only for that reason.