TL;DRA decent mouse with a high price tag. Buy if you absolutely need the Sensei form factor in a wireles mouse...---I have been using the Logitech MX Anywhere (exceptional mouse) for the past few years, on and off with the Apple Magic Mouse, but I wanted something a bit larger but just as accurate and comfortable.Since I liked the Logitech MX Anywhere, I initially bought the Logitech Performance MX Mouse (the big brother to the MX Anywhere), but I found the mouse body's right-hand ergonomic shape a bit too much. The shape wasn't comfortable for me and the hugging contours caused my palms to get sweaty real quick.As I returned the Performance MX, I looked around the store and I came across the SteelSeries Sensei Raw, a wired mouse with paired down features from the gaming Sensei. I had bought a wired SteelSeries Ikari wired mouse in 2009 and enjoyed using that a few years before going with wireless mice, so I picked up the Sensei Raw based on my Ikari experience. The Ikari is somewhere in my garage and I should dig it out since it's a great mouse, but I digress.Unfortunately, I couldn't abide the cord, having gone wireless so many years ago (at least for mice), so I am returning the Sensei Raw as well.That's when I found the SteelSeries Sensei Wireless mouse online. I debated dropping the $126 (shipped from Amazon) for the mouse, but decided since I'm a coder and spend many, many, many hours using my mouse, that it was definitely worth it.And it... really wasn't.The Sensei Wireless is a decent mouse, a little light on the weight and tingy at times. The mouse has a decent quality click (something lacking in many 'performance' mice) and the rubberized surface is great for keeping my hands (ambidexterous) from being sweaty and fighting the smudges (althought not completely successful) of a shiny surface.The Sensei doesn't have all of the macro buttons as other gaming mice (but it does have a total of 4, 2 on each side), but since I'm a software engineer (and only game periodically), I don't need all of those anyway. I had to use the engine software on one of my Macs to configure the mouse (I use Linux as my everyday OS), but once I got everything configured (and flashed new firmware automatically from the engine software), everything works well.I have used the mouse on an inexpensive SteelSeries QcK thin mouse pad, as well as on a few desktop surfaces, and the mouse seems to track flawlessly. In other words, you probably don't need to use a mouse pad (something many gaming mice manufacturers suggest) for everyday work and you won't lose precision/tracking. I like the QcK mouse pad for now so I'll keep that as the surface until I won't.Battery life seems to be good. I've had the mouse off the charger and under active use for over three days and the battery indicator is still showing green (> 30%). I'm unsure if the mouse is being charged or not since the tiny red light is on between the scroll wheel and the DPI toggle button. I think it charged overnight since the tiny pinhole light was flashing blue, but I'm having a hard time tracking down any documentation on the mouse, even on the SteelSeries site. All I really need is a diagram with arrows pointing to the pinhole light and telling me what the colors mean.I'll return to edit this review (or add another) if there are any battery or long-term quality issues that creep in somewhere down the road.Pros:+5 form factor (subjective)+5 accurate with no perceivable lag+5 tracks on some desktop surfaces (without the need for a mouse pad)+4 rubberized surface+2 configuration of LEDs (even to bettery levels), cpi, power saving, 4 macros+2 rechargeable (not sure if charging)+2 may be used as a wired mouse (and charge directly from the USB cable)+1 ambidexterous (good for right or left hands; or just changing it up)+1 cool aluminum charging / proxy baseCons:-5 high cost (not sure if it's worth it)-5 ratchety scroll wheel only (no option to spin free like Logitech)-5 no documentation past marketing material-4 needs the aluminum base to communicate wirelessly (you can't just take the USB cable and mouse on the road)-1 no configuration software for Linux (maybe with the possible success of SteamOS this will change, but a minor issue)-1 a bit light with no weights to configure heft (lightness may be an asset to some; I prefer a heavy mouse)I do like the Sensei elegant understated look (as most SteelSeries-designed products) and the form factor fits my hand extremely well, but is the shape enough to overlook some of the peevish flaws I found with this mouse?Probably not. But close.I think I'm going to return the Sensei Wireless after all since the ratchety scroll wheel is not something I can live with in Linux (since Linux doesn't have scroll wheel acceleration yet). I thought I could push through the scroll wheel, but I miss the free spin options on some of the Logitech mice.To summarize, the mouse is a good option (albeit it pricey) for programmers and pretty much any user if you like the Sensei form factor (I do), want the form factor in a wireless mouse, and don't mind the scroll wheel being only ratcheted. I don't know about gaming, but you can also play with the mouse wired if you're concerned about lag (which I never experiences, but I didn't test with a performance-heavy FPS).