"The Xai is in every way equal to the SteelSeries Ikari - the hands-down best gaming mouse of all time that received a whooping 97% in October 2008 - except for one thing: It's ambidextrous, with two thumb buttons on each side."
"That, as a right-hander, I much prefer the contours of the Ikari is rather predictable, but doesn't diminish the Xai's internal hardware, including a laser that picks up more megapixels than my camera and boasts SteelSeries' peerless tracking."
Score: 95%
"... the SteelSeries Xai is quite simply the best pure gaming mouse we've ever tested."
"Rather than tack on gimmicks like flashing lights and weight systems, SteelSeries has simply taken the basics of a performance mouse and honed them to perfection. Despite being ambidextrous it's incredibly comfortable, tracking is exceptional, and the level of customisation on offer puts other mice to shame."
Score: 10/10
"In terms of ergonomics, the Xai is fantastic. All told it is the most comfortable mouse I have used and fits both left and right hands perfectly. [...]"
"All told, the SteelSeries Xai is the most impressive gaming mouse I have ever tested in our labs."
Score: 10/10
Designed to give players a competitive advantage, the SteelSeries Xai Laser Mouse R.U.S.E. Edition enhances performance with its superior technology and a preconfigured profile setting that optimizes game-play. The preloaded R.U.S.E. profile, created with input from Ubisoft®, allows quick access to the R.U.S.E. and HQ Menus, and preset macro buttons can take the player from the bird’s eye view of the war to the heart of the battlefield in an instant. The mouse also offers gamers the ability to play like the pros and download setting profiles created from some of the world’s top professional gamers.

Part of the research period and sample testing for the Xai and Kinzu mice, with SK Gaming among other teams, was spent at Inferno Online Sweden.

“Above all, the shape of my mouse is key. I was at a point certain that I’d found MY shape – and then this thing reset me for the better.” - Christoffer ‘GeT_RiGhT’ Alesund

Having spent less than 14 days adapting to initial prototypes the SteelSeries Xai and Kinzu, Team Fnatic and went on to win their first grand slam tournament, using these mice.

A total 100 golden-themed SteelSeries Xai mice were created in 2009 as part of promotional campaigns in select countries across the globe.

SK Gaming’s World of Warcraft Sansibar PvP team uses Xai in the EM IV European Championship Grand Finals, to take home gold medals and $7,500.

“The driverless feature ensures a quick setup at events and tournaments, and gives me an identical experience compared to when training – no matter where I’m at.” – Dennis “Walle” Wallenberg

The first custom, limited edition SteelSeries Xai available for purchase, was created for UbiSoft®’s R.U.S.E., and features pre-loaded and pro-gamer recommended mouse profiles.

Fnatic’s Call of Duty team captain, and “Player of the Year 2009″, Stevy “Stevy” Verhein swears to the Xai. Through 2009, he also led his team to be voted “Team of the Year”.