I've always heard good things about SteelSeries, and after seeing the Razer Blade I'm fully convinced that Razer is going to hardware hell. From what I understand Ikari, Xai and Sensei are the top gaming mice SteelSeries offers. I understand that Sensei doesn't offer any performance improvement over Xai. Indeed I wouldn't even have considered the mouse if it isn't for the fact that I can get a Sensei significantly cheaper than a Xai. Is there anything I'm not aware about concerning superior performance or build quality that Xai may offer? I'm also aware that both Xai and Sensei are ambidextrous, with two thumb buttons on each side. I'm a right-hander and I doubt that I will ever use the extra buttons on the right side. Will those buttons simply get in the way or make the mouse less comfortable compared to an Ikari? By the way the Ikari costs as much as a Sensei. Thanks in advance.