RazerViper Ultimate Lightweight Wireless Gaming Mouse & RGB Charging Dock: Hyperspeed Wireless Technology - 20K DPI Optical Sensor - 74g Lightweight - 70 Hr Battery - Mercury White

I've owned both, and wanted to share some insights that I would have liked to have known before laying down this kind of cash for a mouse:Right off the bat, I need to say that the G903 is an excellent mouse but has a massive, fatal flaw: Logitech refuses to source an alternative to the frequently defective switches in its primary buttons. If you google 'G903 double click issues,' you will find that these switches fail at an alarming rate. This happened to me, after around 14mos for the original, 10mos. for the replacement under warranty. Logitech refused to replace the replacement. I consider this failure rate completely unacceptable for a "premium" mouse. My last mouse is 5+ years old and still going strong; I'm only switching because I wanted to go wireless. Personally, I will likely not trust Logitech for some time. If you're willing to take the risk, see below for a comparison.PerformanceBoth of these mice are incredibly responsive. I would be hard pressed to tell the difference between wired and wireless modes on either mouse. Both sensors are excellent and perform well on all surfaces. Both of the mice have 5 steps of mouse sensitivity that can be individually modified by the user in the mouse software. I love this. The G903 has two dedicated buttons on the top of the mouse to move up and down between these sensitivity steps, which is much more convenient than the Viper's single button located on the underside of the mouse. I assigned one of the Viper's side buttons for this, but it's not as convenient.Ergonomics:Both of these mice are ambidextrous. (I'm left handed.) The G903's larger size and rounder shape is probably best suited for a palm grip, but I use a claw grip and was totally fine. The main thing is the G903 is a large mouse. People with smaller hands will likely find this mouse cumbersome. I slightly prefer the G903's side buttons, which protrude further than the Viper's which makes them a little easier to click, but this will be very subjective. The Viper is a little flatter, a little narrower, and a little shorter, and the form factor a little better for my medium sized hands. It's also a lot lighter. The G903 does have customizable weights, although I don't really see the necessity of this.Battery Life:The Viper is rated to have a much longer battery life than the G903, but I found myself charging both of these mice every 3-5 days or so, depending on computer use. The Viper does have the option to come with a dock, which I find convenient. However, the USB connection, though standard, is hidden in an extremely narrow cutout that most generic cables will not fit in. The G903 has a mousepad that lets you charge as you play, which is a cool idea, but it's expensive and really, as long as a mouse lasts a full day it's not that hard to charge at night.Wow, that was a long review. Never done one that long before. I just spent a ton of time researching and a ton of money buying these two mice, so thought I'd try to share some of that.

I wanted to try different mice after using a Logitech G502 lightspeed for a long time. While my G502 lightspeed is by no means a terrible mouse, I wanted something that weighed less and I wanted to try out different mice shapes. After hearing many praises for the Viper Ultimate, I decided to try it out myself to see if the hype was worth it or if it was all marketing nonsense.First off this is an ambidextrous mouse. I am a right handed user and I mainly play with palm/claw grip sometimes transitioning to full palm and full claw grip. The rubber texturing on the sides and its shape makes it super comfortable to use and I have medium sized hands. On top of that, it is really lightweight.The charging dock is an absolute genius idea I wish other big companies would start adopting. You simply plug the dock into your PC, then plug the receiver on the spare usb port on the dock, and when you need to charge your mouse just put it on the dock. If you need to charge it in a pinch, take the usb cable out of the dock and plug it directly into the mouse.Next let's talk about build quality. And boy did Razer deliver. No signs of creaks, has a really solid feel, materials don't feel cheap, and the left/right clicks have really nice texturing on them.Left and right clicks may feel a little off at first if you are coming from mice that have extremely tactile and distinct clicks. That's because they are using optical switches and you may or may not like how they feel but I got used to them pretty quickly. The side buttons however have a really nice tactile feel and despite being an ambidextrous mouse, as a right handed user I never accidently bumped into the side buttons on the right hand side of the mouse. Razer really nailed the side button positioning such that they can't be accidently activated (at least in my opinion).Wireless performance is on par with my G502 lightspeed. No noticeable delays, weird connectivity issues, or any funny business.Battery life is also really good. I usually disable RGB and that really helps with battery life. Sadly I've only had my mouse for a few days so I can't fully test battery life claims.TLDR: An awesome mouse that won't disappoint. I recommend getting the dock combo to get the full experience. I mean, might as well if you're going to drop big money on a wireless mice anyways. I see no reason not to.

Very nice mouse. Feels good to use and is quite lightweight. The charger is a life saver because I hate plugging stuff in and out when I need to use it.

Extremely good mouse. Long battery life. And fits well in the hand. Multiple dpi settings but I'll stick to the 2nd or 3rd slowest 😅