I did not like the lift off distance (too low for my liking), too high click resistance, the build quality (RMB would bend inwards if pressed too hard and plastic feels cheap) and I also just couldn't get comfortable with the sensor. Maybe because my brain was subconsciously expecting the sensor to behave like the laser sensor in the sensei? I don't know but I just could not get comfortable. I did not have those problems with any 3310 mice of a similar shape I tried. Anyhow I am in love with the G102 now, the shape is not quite perfect but I just love the clicks and the sensor. I feel right at home with it as if I have been using it for years. I feel just as comfortable with as as with an IE3.0 only that I haven't used the G102 for like 12 years straight. I am seriously considering buying a couple more of them in case Logitech decides I is too much internal competition for their G Pro.